How One Supernova Measured The Universe

In 2015 astronomers successfully predicted the appearance of a supernova within a couple weeks. How did they do it? Win your Ultimate Tech Bundle by entering Fasthosts’ Techie Test here: fasthosts.com/veritasium (Competition now closed) This video was sponsored by Fasthosts.
Special thanks to Geraint Lewis for consulting on gravitational lensing. Check out his KZbin channel: ve42.co/gfl and books: ve42.co/GFLbooks
The supernova image in the thumbnail is from my documentary, Uranium: Twisting The Dragon's Tail. Check it out here: genepoolproductions.com/urani...
References:
DEJA VU ALL OVER AGAIN: THE REAPPEARANCE OF SUPERNOVA REFSDAL
P. L. Kelly et al. arxiv.org/abs/1512.04654
Predicted properties of multiple images of the strongly lensed supernova SN Refsdal
Masamune Oguri. Monthly Notices of the Royal Astronomical Society: Letters, Volume 449, Issue 1, 01 May 2015, Pages L86-L89, arxiv.org/abs/1411.6443
Multiple Images of a Highly Magnified Supernova Formed by an Early-Type Cluster Galaxy Lens
Patrick L. Kelly et al. arxiv.org/abs/1411.6009
"Refsdal" meets Popper: comparing predictions of the re-appearance of the multiply imaged supernova behind MACSJ1149.5+2223. T. Treu et al. arxiv.org/abs/1510.05750
Irwin I. Shapiro (1964). "Fourth Test of General Relativity". Physical Review Letters. 13 (26): 789-791. doi:10.1103/PhysRevLett.13.789
Irwin I. Shapiro; Gordon H. Pettengill; Michael E. Ash; Melvin L. Stone; et al. (1968). "Fourth Test of General Relativity: Preliminary Results". Physical Review Letters. 20 (22): 1265-1269. doi:10.1103/PhysRevLett.20.1265
Research & Writing by Stephanie Hamilton, Ralph Crewe, Petr Lebedev, Derek Muller, and Jonny Hyman
Animations & VFX by Jonny Hyman & Ivy Tello
Thanks to Jaime Portsmouth for his gravitational lensing simulator and help enabling it to render simulations.
Supernova simulations courtesy of Adam Burrows
Numerous hubble images by Hubble Legacy Archive, NASA/ESA/STScI
Numerous images by ESO / NASA

[@3nimac]

Its incredible how much info scientists can extract from these tiny little smears of light

[@karatewill75]

Its incredible they can discern different stuff. Before the several images of the galaxy were circled I was looking all over the screen for them. If you handed me that picture before I watched this video, I would've told you they were different galaxies.

[@McToasted]

Meanwhile, there are climate change deniers, flat earthers and vaccine haters. I wonder which groups are the knowledgable ones...

[@thearchetype9829]

Veritasium you can make video on SERPINKI'S triangle The same as one I have made CREATE SHADES USING SIERPINSKI'S TRIANGLE AND YOU SMART PHONE kzbin.info/www/bejne/en68n5JmqrmJeJo

[@abdu2s]

Incredible indeed. If they only put that effort into things that matter more like COVID-19

[@karatewill75]

@@abdu2s I... you are aware that not everyone is a microbiologist/biochemist right?

[@bassett_green]

"Do you notice that the same galaxy appears three times in the image?" Yeah I *totally* noticed

[@arun2686]

😂

[@hyree]

Would that mean... we're seeing more galaxies than there actually are in the sky?

[@JorgetePanete]

@@hyree you have to substract the ones not visible

[@postmann_pot]

@@hyree maybe they're all the same galaxy, being projected around a super massive black hole. Seen at different points in the timeline🤔😆

[@PersonManManManMan]

Todally man

[@miketacos9034]

“Hey did you catch the supernova? If not, no worries, they’ll play re-runs in a year. Or twenty.”

[@rustusandroid]

The more we learn, the crazier the universe becomes.

[@ViperDivinity]

we dont even know how deep our oceans is, let alone the Universe where everything doesn't make sense

[@Jveir]

@@ViperDivinity Except that it does

[@kxufa4507]

@@ViperDivinity The earth's deep sea is denser than you think, it gets dark every time you go deeper in water. It’s also like being in space but in water, you can’t even see, It’s like being inside a huge fog. So it’s hard for scientists to explore and find new sea creatures. Edit: My comment was confusing. So basically Earth’s deep sea is much more like space but it has an end and it is much more dense. once you enter a zone where no light would no longer could reach; you could experience very much pressure. And the thickness of fog made it so hard to see; it could be hard for scientists to search for creatures.

[@mzreina74]

@@kxufa4507 our ocean is basically space

[@BryanM61]

It's not so much that the universe is 'crazy'; the universe is what it is - and is absolute truth. It's more that it's beyond our (humans') realm of understanding...kinda like an insect trying to understand calculus. We're making progress tho.

[@ninadn]

Teacher in online class: why are you late? Me: gravitational time delay.

[@ZaHandle]

me an intellectual: gravity on the bed is 8g

[@darkinators]

@@ZaHandle more... about 8.4g

[@ZaHandle]

seriously tho anyone know why?

[@rko12]

This excuse would work if we live on a neutron star and teacher is living on higher floors than your home. Actually in such conditions instead of time zones' discrete set based on longitude, like on Earth, it will be time rates continuum based on height levels, because of different distance to the center of the "black city-size star with about the mass of the Sun"

[@ZaHandle]

@@rko12 props to the architect who designed a 2 floor house on a neutron star

[@TheBandzuga]

So this indicates that multiple generations of aliens would see me getting rejected by my crush. Interesting.

[@theshadowmonster1]

Eh Branimire branimire

[@ShadowPhenix273]

I can just imagine the aliens watching us getting rejected and thinking "ha, noobs"

[@cheegum6296]

Not only that but Aliens millions of years from now

[@coolmarkyt]

not if we nuke 'em first

[@cheegum6296]

@@coolmarkyt lol we've already been talking about nuking mars 😄😄😄

[@rars0n]

This blows my mind. I've always understood the concept of how objects in the sky are so far away that it takes a long time for the light to reach Earth, as if we're looking into the past. But I never considered the fact that objects between us and what we're observing could distort our observation. Science never ceases to amaze me.

[@ForcesNL]

The crazy thing is that it reaches us at all, as if those objects are transparent. It's literally seeing around objects, crazy. Space is so strange. In "micro" scale it appears to be affected by mass. How can something stretch so violently while mass holds it's ground.

[@dangeros31]

That last sentence kinda feels wrong here. Instead of "Science never ceases to amaze me.", I feel it more appropriate to say "Reality never ceases to amaze me".

[@shozinryu4]

@@dangeros31 Science doesn't equal reality. What you are referring to as "science" actually refers to the scientific method which then provide results. But these results can change if the components in it are not constant. A.k.a variables. Variable expressions can change results thus by your definition change reality.

[@dangeros31]

@@shozinryu4 I'm not saying Science is reality. I'm saying that reality is what already exists regardless of our perception; it is constant. Science is used to figure out reality, but even then Science can and is wrong, because, like you said it is always changing. Take for example the big bang. People take it as fact, but it is still just a theory that can not be completely proven. The smallest amount of evidence of scientists and people's ideal perspective of the world and universe can lead people in the wrong direction, thus making up their own false and ideal science that helps them cope with their lack of evidence. Science is just a tool to measure and observe, while reality is fact and constant; weather it can be correctly observed is another thing.

[@thelocalnecromancer1224]

@@dangeros31 whether* not weather.

[@booksandvideos]

The fact that there are multiple images of the same galaxies, delaying the light that arrives to us at different intervals is blowing my mind. I never knew something like this exists. It's cool to keep learning new things about space that continue to astound me. I'll never get tired of it.

[@PK-qs4dx]

Veritasium: Trying hard to explain gravitational lens Me: 6:28 Smiley face

[@timedilatesme]

Same here 😂😂

[@chriseffpunkt4333]

yup

[@denyraw]

Probably the biggest smiley ever

[@RichardCox0]

Saw it right away, how sweet

[@ricardoabh3242]

Why Dereck did not do a quick pun there? lol

[@martixbg]

What I learned from this video: Cosmologists are smart AF.

[@mysteryman3239]

Yes

[@mohammadumair3108]

Me too.

[@popazo8556]

Astrology is amazing

[@starnutron6147]

@@popazo8556 this is astronomy not astrology

[@maxwellsequation4887]

@@popazo8556 tf

[@thiccyoshi4334]

damn I didn't know this "Einstein" dude was so famous, his bagel shop must be booming

[@filipbitala2624]

I cant believe it, every time there is anything sciency in film they say quantum or hardron or something, why dont they just use this einstein guy

[@nihalbhandary162]

@@filipbitala2624 quantum and Einstein? lol those 2 things are polar opposite of each other.

[@alfredoalfaro5000]

One of the few youtubers that always produces top notch content is now pouring it en masse! Guess not all is bad for 2020.

[@marcperez2598]

The 2020 Redemption Arc is starting now. We got Bolivia kicking out fascists, Veritasium pumping out content, and humanity starting to wise up a bit. Let's hope this trend continues

[@pjl2320]

Shhh 2020 might hear you

[@bobdong4462]

in "mass" badum tssss

[@strangerwithscience3597]

Ummmm... One video a week is not en mass

[@craigchapman2676]

Compared to previous frequency, this is en masse

[@lukaswenzl6749]

It is awesome to see you talk about such current research in Astrophysics. As a Phd student who grinds these papers every day it is a joy to see you manage to share these concepts so understandable and yet very accurately. It is a joy to watch!

[@darshild.makwana3283]

hiii, i also want to become an astrophysicist and for that i have to do phd so share some information plz...

[@peejay1981]

I'm glad there is someone who can explain it to us in a way we understand! I'll just stick to my electronics.

[@gilgamesh981]

"phd student" XD why would you do this to yourself

[@lukaswenzl6749]

@@darshild.makwana3283 I am happy to share some insights! Just shoot me an email

[@raimonestanol8234]

Yet I fail to understand which law made the "shorter" path "longer" for light to travel. Also how do X-rays show us the early universe? Also a gravitational lens?

[@iver1343]

I never heard someone pronounce Betelgeuse as beetle juice tbh

[@chalybee8689]

Same

[@Amberscion]

And I've never heard someone pronounce Betelgeuse any other way than as 'beetle juice.'

[@l444.2]

@@Amberscion like rlly who tf named that

[@Amberscion]

@@l444.2 The natives of Betelgeuse, of course. And you should hear them laugh about our planet's name: "Y'all call it Dirt? Really? Bwahahahaha!!!!"

[@randomblackhole9933]

Battle geese?

[@musicman0423]

So basically, every moment of every day is echoed through the eternity of space time, for all eternity? That’s pretty friggin amazing. The observable light that reflects from us out into the cosmos never goes away. Yeah I don’t feel insignificant or anything lol

[@86GT11]

Extraterrestrials in other galaxies be like, "Meh, I've seen this KZbin video back in 1995.

[@jamiehosmer1481]

How can you feel insignificant?! You point it out so well yourself -- eternal echoe. My dude, you're existence is permanent and forever. That thought makes me feel way more significant despite the size of this big place.

[@paragn667]

No one is insignificant compared to the universe, think of it like this, we are part of the universe, the universe is part of us and we are part of the universe.

[@herrdaniel7607]

You are insignificant if nothing will ever know of or acknowledge your existence. If your existence echoes throughout the universe, how could you possibly be insignificant?

[@Dmcjixjdndncnc]

@@jamiehosmer1481 well.. yes and no… although we are echoed throughout all of spacetime, isn’t there an end to the universe? Or at least the 4 proposed ends that astrophysicists have come up with? so is it a finite echo then, rather than an infinite one?

[@aurigo_tech]

That is legitimately mind blowing. To see the exact same event not just on multiple places, but also at different times. And not only twice but six times? Imagine that in an ordinary world setting. Literally deja vu.

[@R3bel02]

You can, with a camera. You can see the same event from different perspectives. It's pretty much the same. The light from the event from different angles.

[@subhadeepchakrabarti]

Wow, deja vu, you've found a great connection!

[@asitkhanda]

Or maybe something similar happens with multiple universes or maybe with alternate universes and we think we experienced Deja Vu. The possibilities are infinite and we are yet to discover so much more. Wow.

[@pavel9652]

​@@vasile.effect It is probably not a supernova. You could find this object yourself in publically available online databases of astronomical objects and check its type. Find the first galaxy in question or lensed supernova first and then compare images. It might be tricky because these tools can be complex and built for professional astronomers, but you can do it with a little bit of trial and error ;)

[@pearcomputers]

That is legitimately mind blowing. To see the exact same event not just on multiple places, but also at different times. And not only twice but six times? Imagine that in an ordinary world setting. Literally deja vu. vu vu vu vu vu... what if that was reality and we're all just so relatively close that no 1 here notices - Oh, I found your cat by the way xx

[@AverageAlien]

This is the kind of content that needs to be on the trending tab

[@nickllama5296]

The large, large, large majority of mankind will look at this video and have absolutely no clue what on earth he's talking about.

[@jimlahey5354]

Too many stupid people though.

[@Miranox2]

Thinking hard. Brain hurt.

[@RahulKumarAitian]

@@nickllama5296 when we have 100 thousand of human still debating whether earth is round or flat, such content is not going to trend in next few years.

[@josepalacid]

Are you asking KZbin algorithm to work against the interest* of their investors? *wherever "interest" is written it has to be read as "money".

[@stoichioman9944]

"How fast are we expanding?" Judging by the amount of tacos I'm eating... We be expanding fast

[@kumarvishal6558]

good analogy my friend....laughing emoji

[@felixliu5149]

expansion

[@ddawson100]

That closing remark beginning @11:36 is amazing. I had to go back a few times to listen to that. “What is contained in those distortions is information about the workings of our entire universe.” It’s really amazing how we can see so far away and glean bits of information.

[@broccolirob5026]

I’m so glad there are people smart enough to know what’s going on when they look through a telescope lol

[@emmadabdelkrim3073]

Why ?

[@broccolirob5026]

So they can tell dumb people like me about the blobs of light I’m looking at

[@joeblack1126]

But do they I wonder.

[@broccolirob5026]

@@joeblack1126 there’s probably a bit more speculation than they’d like to admit 😜

[@noahway13]

@Waldel Martell I don't agree. If they had smarts and discipline, they would already be something worthwhile .

[@ChathuraJayasundaraIMD]

Quality or Quantity, choose one and choose wisely Derek from Veritasium: I choose them both ❤️❤️❤️❤️

[@thearchetype9829]

Veritasium you can make video on SERPINKI'S triangle The same as one I have made CREATE SHADES USING SIERPINSKI'S TRIANGLE AND YOU SMART PHONE kzbin.info/www/bejne/en68n5JmqrmJeJo

[@seemysight]

that what a decent team working like an well oiled machine can do

[@veritasium]

it's not sustainable. I'm gonna need a break after this.

[@Pingviinimursu]

@@veritasium It's very good that you know your limits. I think you can also be a good example for a lot of people who might not be as conscious of their capabilities. Take all the time you need, we'll be waiting for you when you come back!

[@SnapThority]

@@veritasium Don't worry, just go take however long you want, and come back to produce more videos with greater zeal!

[@skatedude4882]

6:32 my sleep paralysis demon smiling at me in my dreams

[@cycrothelargeplanet]

Lol

[@Vestalana]

Agreed...

It is so refreshing that somebody not just asks more questions, but answers the ones I was never even asked, but always wanted to know!

[@mctthw]

Teacher: “don’t worry, angry eye smiling stars aren’t real, they can’t hurt you” Angry eye smiling stars: 3:47

[@alnaskabeer1361]

I like to imagine it as lasers coming from the eyes of a distant supermassive alien

[@thearchetype9829]

Veritasium you can make video on SERPINKI'S triangle The same as one I have made CREATE SHADES USING SIERPINSKI'S TRIANGLE AND YOU SMART PHONE kzbin.info/www/bejne/en68n5JmqrmJeJo

[@jamirimaj6880]

ratioed by smiling stars 6:28

[@craigg4251]

this actually made me laugh so hard

[@JackSalzman]

Wow lmfo

[@PapaFlammy69]

Spacetime be like: But, will it bend?

[@FoxamPL]

but can it do this?

[@samovarmaker9673]

b-but the fundamental theorem of astronomy is π = 1, h-how can astronomers measure things so p-precisely?

[@devilixh253]

Bends so hard the strings might break

[@devilixh253]

@@samovarmaker9673 fr? π=1? Here i thought π=3 was bad enough

[@pietro93vit]

Surely djent

[@sylwiadrozd9899]

Your videos are so fascinating, Derek, that I forget about my duties. Great, high quality content and your professionalism in each episode. Waiting for more cosmic news from you. Lots of love...:)

[@lmamakos]

What a great description of gravitational lensing! I'm just an amateur astrophotographer and have managed to image the "Twin Quasar" with my equipment, but I could never quite understand how the lensing produced (in that case) TWO images rather than some other effect. I think that I now less confused than before, so yay!

[@therealKINDLE]

Yeh right! When I look in ze mirror, I don't see two reflections do I? Oh.. wait..

[@tylerdurden3722]

@@therealKINDLE a lense, and a mirror are not the same.

[@austin5060]

Even got the updated Betelgeuse distance from just this week Nice touch

[@rubi-blythin8885]

@@AxxLAfriku what

Two types of youtube comments.

[@sillybilly4710]

@@rubi-blythin8885 just always mark this guy as spam

[@Piwde]

I can't believe there's actually a star pronounced beetlejuice

[@larryscott3982]

Pog Made more difficult by its spelling Betelgeuse

[@addemater]

Quality content like this deserves "KZbin Tenure." I couldn't imagine a world without Veritassium.

[@ASLUHLUHCE]

Gravitational lensing makes things show up at different places AND at different times. Now that's cool !

[@slash196]

"Different places" and "different times" are two ways of saying the same thing. Now THAT'S cool.

[@rdmz135]

@@davidsantiagoalonso its a bot

[@ssxxxss]

@@davidsantiagoalonso it's a bot:")

[@mukrifachri]

Yeah, this is some new revelation. We've gone through the simpler location-based ones, but making sure that time goes with it is something.

[@mukrifachri]

@Amey Shinde And at different moments as well ! Otherwise the observation wouldn't work.

[@Wishkeyn]

The appearance of technology and knowledge related to photography when it comes to cutting edge science is something that amazes me.

[@hitarthbulsara9649]

And then, there are flat earthers😓

[@ricric1978]

wow they named a lotta things after this “einstein” guy. he mustve been smart

[@pewds6910]

yeah, but he probably plagiarized a lot

[@louisrobitaille5810]

@@pewds6910 Someone clearly has no idea who Einstein really is and what he did...

[@leon_brave_racing898]

Or just creative and persistent

[@pearcomputers]

@Nirek Setty st1 - modest too and loved beer apparently ;) Barman! .. yeah ok, I'll do the same.

[@honglee6880]

Ong yean yen is smarter.

[@llaughridge]

"A star might die only once, but with Einstein’s telescope, if you know where to look, you can watch it scream forever."

[@freyjaandersdottir3311]

Well, that's not at all ominous or creepy!

[@Lighthouse_out_of_order]

True poetry! This is the most underestimated comment of the month. Thanks for the chuckle.

[@the_real_vdegenne]

scream ? why screaming ? It's just a ghost dancing in grace.

[@levimullins5693]

@@the_real_vdegenne Violently exploding isn't graceful

[@abicol6010]

I wrote about this for a school project two years ago! But even though I already knew about this discovery, your visuals and explanation were still super infomative! I can't believe I just found this video.

[@This-K9]

Okey.... Thats enough internet for today.

[@ashishsharma-og4nl]

BRO YOU'RE CRANKING VIDEOS LIKE CRAZY!! HOWW?

[@veritasium]

Two things: I've got a team now, and sponsor deadlines haha

[@mastershooter64]

@@veritasium awesome!

[@michael04__806]

@@veritasium ur amazing

[@ashishsharma-og4nl]

@@veritasium and you'll always have our support too On behalf of your subscribers

[@SulemanAsghargoion]

@@veritasium hope that you are alright though.

[@RaviKumar-cn7pt]

Man: No one bends like her Universe : Hold my gravitational Lenses

[@laimisss3]

lol

[@drover7476]

Hahaha one of the best astronomy jokes I've ever heard

[@ZackestTV]

Bazingaaaa

[@pakobholo]

itna dimag kaha se late ho

[@roberthawthorne8396]

Not lensing. It's refraction from changes in plasma density.

[@Kujeful]

Thank you for the wonderful video again, Derek! I came back to it a second time, and noticed at the end you say you used to think of universe like it would be glass, and how strange it was. How do you view the universe now afterwards? I'd still think of it roughly a glass-like substance in the sense, that light travels slower through denser materials, or takes more time to traverse a thicker part of the glass. Just that in the case of the universe, that thickness is tremendous really. Curious thought I think. Here's to hoping there are other similar events coming up!

[@javiersolis2993]

It's just mind blowing how much information scientist can extract from those images!

[@harpreetdhaliwal2127]

Happiness is seeing Veritasium’s new upload notification.

[@MrPokeboy8]

yes

[@Runeansfelt]

Do Veritasium have merch? It's the best educational channel. ❣️

[@MichaelSBaram]

Actually, its chemical reactions in your brain...

[@mystic2997]

Simp

[@Kushb4an]

No its vsauce.

[@biggiecheese3377]

this makes me think about how lucky we are in the universe, we have perfect solar eclipses, we have a bunch of planets in our solar system, and we got a perfect view on a duplicated supernova and its host galaxy to go with it. I can't believe how you get all this information, and how you teach it so well

[@connormeagher2203]

there are multiple people that work at Veritasium and that spend hundreds of hours doing research on this sort of stuff and making sure it is correct

[@JEAthePrince]

Not lucky. Blessed.

[@captarmour]

i think it was Robert Jastrow who said 'The Universe Knew we were coming'. it has been said we live in 'perfect real estate!'

[@fhz3062]

Douglas Adams, the water pounding fallacy. ;)

[@sulaimaanchamda4501]

@@fhz3062 whats that about, is ther somewhere i could read about this fallacy?

[@randomhunter47]

I come to KZbin to watch the British GP highlights and now it's 4:19am after a couple of vids from this channel. Fantastic stuff

[@jimjimjimjimjim6572]

ugh man I never want your content to stop. especially when it's about SUPERNOVA

[@anniekallen4472]

Me: *shrug* Can't we just call it roughly 70km/s? Joseph Silk: It is a possible crisis for cosmology.

[@Yadobler]

Astronomers: ye ±10000 years Also Astronomers: NO ±1 IS 🚫🚫❌😤 (but ye, the consequences of having such large range of values is that anything to do with a tiny difference in rates and changes will balloon up and really grow dramatically when used with real data values, that the error margin is as good as saying a human lives on average of 1ms to 2*10^14 years.

[@rancidalankar1322]

If we are taking a rough estimate, I would suggest 69km/s which can be called NHC or Nice Hubble constant .

[@thorstensteffen3640]

@@rancidalankar1322 big brain

[@sans.1hp]

@@rancidalankar1322 noice

[@jerbib9598]

@@rancidalankar1322 - the Hubble constant is variable in time because in different regions the strength of the dark energy is varying with the density of the virtual particle activity in that region.

[@austiniscoolduh]

If a supernova is as bright as the moon, maybe that’s why some old paintings had 3 suns/moons in the sky. One of them was a supernova that was there for their whole lifetime

[@IWillBe13]

I think if 3 moons would have been in the sky for a whole generation as you suggest then that happening would have been historically marked somewhere. In other words, we would have know about it

[@TheZahirNT2]

I don’t think it could maintain that level of brightness for more than a few months at most.

[@mimih22a]

10,000-20,000 years ago. The earliest possible recorded supernova, known as HB9( also known as two sun's), could have been viewed and recorded by unknown Indian observers in 4500±1000 BC. In 185 AD, Chinese astronomers recorded the appearance of a bright star in the sky, and observed that it took about eight months to fade from the sky. It was observed to sparkle like a star and did not move across the heavens like a comet.

[@maedhros9285]

Veritasium at 8:16: So scientists had been studiyng this clusters years before the supernova. That is especially impressive, seeing that the Nova happned billions of years ago...

[@notkaisan]

'Someone : spilled a coffee' Scientist : "new universe have been discovered"

[@evandotpro]

This absolutely blew my mind. I expected nothing less from you, Derek. Thank you for everything you do.

[@luqcrusher]

6:27 the galaxy is smiling at me im uncomfortable

[@jettaeschroff6924]

:)

[@thetekneiqueandotherrandom409]

That's so true

[@FatePillager]

Looks like Walmart is about to slash prices in a galaxy far far away

[@my_stuff4210]

:)

[@francisconegrete5773]

@3:47 is even more lol

[@speckitis]

An AGN could also have “time stamps” in it’s spectra that can be used to differentiate the light paths in a multi-lensed system. There’s an AGN in the northern hemisphere (I forget its name) with two distinct images that differ in age by a little over a year. Neat stuff.

[@astrospeedcuber]

I am mind blown and completely overwhelmed by all this info, love this amazing channel!

[@derreckwalls7508]

Watching Veritasium convinces me that nothing is beyond our human capacity to understand, and that I understand so little of it. It is humbling, encouraging, mystical, logical, frightening, and comforting all at the same time. It is a wonderful universe. It is a wonderful channel. Thank you.

[@thegr8malachite370]

Thank you for your comment!

[@guilhermelouzada56]

yes, there is a thing that I strongly believe humans could never understand, quantum mechanics

[@ice_wallow_come5449]

Another existential crisis for a week 😛😛😛

[@mukrifachri]

Given a very large amount of time, we'd eventually understand things - but how long would it be compared to a single human lifespan, we just don't know, and some things would likely remains not understandable when you die. Still, it's possible to fall to the cracks, and that day will have to wait a bit longer... kzbin.info/www/bejne/a5m5npiFeK-dhbc -> interesting talk from Sean Carroll (the idea once featured on Veritasium's channel as well).

[@ChrisInmanDrums]

I watch these videos now with renewed excitement and interest. I finally started at University of as a Physics student after years of watching videos by channels like this, which eventually led to my passion developing to the point where I had to take it more seriously. Crazy to think that, despite officially leaving education years ago, KZbin channels like Veritasium would take me back purely out of a genuine interest that I never felt for any subject when I was actually in school. The point of this comment is to say thank you for the inspiration!! And to keep this sudden flood of videos coming! :D

[@ratnavallisekuru4784]

Incredible . I was awstruck to know your version of sky as a transparent lens thereby giving multiple images of the same object ..a supernova.. hatsoff to you..Derek

[@arsalanafrakhteh7226]

I just can't get enough of your contents! Thank you so much!

[@Localguitarman]

Bless this man, he's putting out so much quality content for us

[@thearchetype9829]

Veritasium you can make video on SERPINKI'S triangle The same as one I have made CREATE SHADES USING SIERPINSKI'S TRIANGLE AND YOU SMART PHONE kzbin.info/www/bejne/en68n5JmqrmJeJo

[@sverma6811]

I am a student in 9 th standard I wasn't much interested in science until I started seeing your videos , I think it's been a year and a half since I saw your first video . I was so satisfied that I started watching more of them and in no time I found my perspectives changed.Science had become my favourite subject especially physics .This happened just because of you.I would like to thank you from the depth of my heart for that .I feel now that I have an option to pursue in my life ahead as a career, in science and now I am hopeful for my future which I wasn't earlier,perhaps.Thank you so much sir! Please continue making videos on such topics .Your way of explaining topics is better than any other channel on you tube as far as I know( perhaps better than even my teachers). Really appreciate your videos !!!!!

[@varunahlawat4863]

I'm a random science guy advice: only science education could change our probability of survival! Now it is most probable that we're gonna extinct! Great you got the right way, encourage others who can't never tell your friends to take what they want, tell them to take science, I'm too from India and ya you will discover that how wrong are RELIGIONS are how wrong are the things we were taught... enjoy...

[@Musiphymatic]

@subrat verma Same as you I too developed interest in Physics because of Derek and Michael Steven(from Vsauce) and I am really grateful to these guys. Best of luck for your future. And btw I am from India too :)

[@sverma6811]

@@varunahlawat4863 You are absolutely correct And besides that we are taught things that assume only historic Importance nowadays. For e.g. I am being taught gravity the Newtonian way even today it's been more than 100 years for General relativity But it's mentions are not till high level university courses in India. So that definitely something wrong with the education system Thanks for your reply!!

[@sverma6811]

@@Musiphymatic Thank you very much bro V sauce is also a pretty good channel, I really like that channel and apparently I got to know of Veritasium from Vsauce's Lenz'law video

[@sverma6811]

Both the channels(V sauce and Veritasium) are equally good and perhaps the best online learning sources

[@wplaat]

I learned today sometime. Really great content. Keep on the good work

[@keithivey6175]

Thank you so much for this fascinating episode . I am hooked

[@FronaldChettiar]

Me everytime I click on a Veritasium video: Easy peasy. I'm know it all Midway through the video: holy moly, wtf did I just hear

[@TusharGoyal1997]

Derek: How many Veritasium videos you want this quarantine? Me: Yes!

[@TheSecondVersion]

There is only one veritasium video. You're just seeing multiple versions through a gravitational lens.

[@alfredjames4530]

I have to report you twice because you violated 2 of the guidelines please in the future don’t do it again

[@takeizo]

What does his channel name mean ?

[@gamaltk]

@@TheSecondVersion Hahahah nice one

[@user-sl9uq8rl2t]

@@takeizo An element of TRUTH

[@Sp1der44]

A really good explanation of a kind of mind blowing phenomenon. Great stuff!

[@erosa1983]

Thanks, man you explain such a complicated things in such an easy way that even an amateur can understand all

[@Dillinger86]

My 5 year old nephew loved watching this, he had an endless list of questions for me during & after lol.. He can't even sit for 2 minutes for his online kindergarten classes but he can sit still through this entire video.. Well done man.

[@aaroncameron1494]

This is nuts. The split image of the galaxy really appears that far away from the original.

[@JacobRy]

@RITA , I LOVE SЕХ , WANT SЕХ !!! OPEN MY CANAL !!! no

[@konstantinkh]

They are actually very, very close together in the sky. The light is deflected by a tiny angle, and you would not be able to distinguish it from single source by eye even if it was bright enough to be visible. Hubble, however, has an absolutely incredible zoom, allowing it to take a region of space that would look to you like a single point in the sky and expand it out to show all the galaxies and clusters of galaxies that are there.

[@krb4179]

This is very interesting. From the perspective of the viewer, time not being linear is an extremely cool concept... Gravitational Tarantinoing.

[@mmehdi3437]

Whenever i feel like i need to know more about the universe, i check this channel !

[@TheNameOfJesus]

All I see at 6:24 is a happy-faced smile.

[@mikev3279]

Smiley space 🙂

[@STriderFIN77]

:-)

[@gallium-gonzollium]

3:46 as well

[@chuckclark6162]

I see a demonic Koolaid Guy.

[@chuckclark6162]

@Shinay You're the type of person that wakes up on a Monday morning and immediately takes to insulting people on social media... Your life sucks, but not as much as your syntax.

[@dellhpfree]

It’s mind boggling that we have people who believes that Earth is flat and only 6000 years old.

[@GD15555]

And what do you think it is? Cube that’s million years old?

[@Kislay11]

@@Wu-Zi-Mu he is trolling dude

[@loudeclercq]

That's absurd, Earth is only 5000 years old !

[@NimbleRedFox064]

The Bible tells us it is around 6,000 years of course. Around 2,000 years from Adam and Eve until Noah and the flood, then about 2,000 years from that until Jesus Christ died on the cross for our sins, and about 2,000 years from that until now. And if you think that is just a story, then why do you think the whole world uses the time frame of B.C and A.D? The Bible lists the genealogy from Adam and Eve all the way to Jesus Christ, so you can technically add all of that time up plus the year it is now and it will be around 6,000 years. Oh and also the Bible states that the earth is round.

[@superbaddctv]

This was one of the coolest and informational videos I’ve seen in a while

[@NoobMaster-or2jf]

This is so cool. You really have an eye for this thing!

[@NikhilSingh-mk9kc]

I still giggle like a kid when seeing your videos like I used to 10 years ago. There's something so beautiful about understanding the mysteries of the universe. It's almost poetic

[@malhar073]

This guy can convince me to take the blame of crimes i didn't even commit.

[@Nipun_Chauhan]

Fr 😂😭

[@KalpeshRingasia]

🤣🤣🤣🤣🤣

[@leexingha]

i smell BL

[@teckzusferalupus5382]

You commited it, the information is just delayed by gravitational lenses.

[@Alex-jq5ft]

This killed me, it's so true

[@starpunktowerpunk9472]

"So just try picking the star that is going to explode" I couldn't stop laughing! My throat's burning!

[@richiebricker]

VeryCool stuff! Thanks again for making these videos. It seems harder to get this kind of info since Discovery channel went all Naked and afraid and ghost hunting but we still do get accurate information about how many crabs can fit in a boat and that Pirate Captains dont really leave their gold behind. There is amazing amounts of new discoveries that youve let me in on and now that crazy James Web Space Telescope is gonna fly soon, Im overjoyed

[@danielstephenson7558]

Gravitational lensing blows my mind. "Oh, those four galaxies you can see over there? Yeah, they're the same one..." Madness.

[@Zalamedas]

It's crazier than the looks. It appears not only in different locations, but different times. It's really mind boggling

[@YCbCr]

@@Zalamedas It's not just looking in the past, but you can choose which past are you looking at. 20 years, yet lightspeed. What had it got to go through...Fascinating.

[@FlyingSavannahs]

Awesomeness.

[@karlkarlsson9126]

The time-dilation measurement blew my mind

[@redkb]

So cool.

[@ssxxxss]

Have to agree.

[@ricardorix73]

Shouldn't you be solving puzzles of something?

[@xXJamaikaXx1]

Heeyy Red I really miss your cubing videos

[@cpt.taselbymc8400]

Lmao, of course you're here

[@athena706]

OMG I remember you from when I was a child! I use to watch your unboxing videos everyday! You got me into cubing when I was around 9, but I've stopped. Now I got to find my collection of cubes lmao XD

[@daniochoa2110]

Beautiful video. Great images, great animation, very well explained

[@markhuebner7580]

Wow! Thank you! Awesome clarification of the Einstein Cross/Ring gravitational/time realities!

[@jeffersfilms]

Today i learned betelgeuse was pronounced “beetlejuice” 😂

[@rafijaxsen7227]

Do NOT say it three times!

[@BluePieNinjaTV]

@@rafijaxsen7227 otherwise it will go supernova

[@samovarmaker9673]

Bettel goyzer

[@BillGreenAZ]

Astronomers couldn't even get its distance correct within 25%. I highly doubt many of the other measurements they publish.

[@olsevcan2]

Scientists are on top of their meme game

[@DanielSMatthews]

One of the most impressive pieces of astronomy work I have ever seen, to actually come up with a testable hypothesis and have it confirmed is science of the highest quality.

[@shinji906]

Well that's literally how science works. You make a prediction, then you make an experiment to see if the values you get from the prediction match the experiment values. If they do, your theory is probably correct. Every once in a while, your theory doesn't predict the outcome of a specific experiment, and the science cycle continues... At least that's how I understand it

[@DanielSMatthews]

@@shinji906 Yep, but how much of "science" is really _science_ then? See now why I am impressed?

[@thearchetype9829]

Hey Veritasium you can make video on SERPINKI'S triangle The same as one I have made CREATE SHADES USING SIERPINSKI'S TRIANGLE AND YOU SMART PHONE kzbin.info/www/bejne/en68n5JmqrmJeJo

[@DanielSMatthews]

@@thearchetype9829 I'd rather see a video about this idea and what possibilities it opens up, dsmatthews.blogspot.com/2020/04/covid-19-solution-changing-rules-of.html

[@sorjhan2214]

Its crazy how far we have come in the last 50 years or so... in our understanding of the universe and its mind boggling how far we will be in the next 50.

[@THE_MOONMAN]

One of the most interesting videos I've ever seen on this platform. Super cool stuff

[@soumendutta1084]

I watch these videos & I wonder how tiny we are & how short a period of time we exist..yet every problems that we face seems so big & significant in such a short period of time we live. These space videos makes me forget every pain that I have..😊

[@wobblysauce]

We are but an ant, many times smaller than the things above us.

[@MusiXificati0n]

I'm always astounded by how smart some scientists are. Especially physicists. And here I am, frustrated by my excel shenanigans...I think I still have a looooong way to go :c EDIT: Thanks for the supportive comments about my excel frustration :D you are very wholesome :3

[@zwz.zdenek]

Mathematicians are arguably even smarter, but you need to work hard just to appreciate that. Physics' connection to reality gives it ways to get popularized.

[@vivianmiranda397]

I’ve struggled with Excel a lot also :) (and I sign the H0 paper cited in the video) - so dont despair!

[@MrTorchia1000]

To be fair science has had to literally change around excel's stupid bulshit.

[@Kycilak]

Yeah, Excel can get headaches even to bright people. I work in a membrane laboratory and it is pain for all of us.

[@cachecollin6984]

@@vivianmiranda397 that great seeing y'all people gather here

[@zumabbar]

at first i thought "wait so they didnt actually predicted the appearance of a NEW supernova?" but then it hit me how insanely impressive this actually is.

[@krism6171]

I absolutely love space and I hope one day im able to contribute to the research of it

[@markdowse3572]

Looks like Arthur C Clarke got it right when he wrote: "It's full of stars." in 2001: A Space Odyssey That lensing effect must make a tricky job even trickier! 🤔👍

[@dr.michaellittle5611]

“ objects may be closer than they appear”

[@achyutarjun]

It's so fascinating how light travelling from the same supernova different amounts of time to reach earth, depending on the path it took, they are literally 20 years apart. That's how big this universe is. Maybe bigger, considering the explosion happened before the earth was formed. And, to think that its still expanding, and there is the possibility of the existence of a multiverse is simply un-comprehendible to my basic layman brain.

[@whirledpeas3477]

So nice to learn things from V that everyone already knows. I mean everyone that doesn't live under a rock.

[@ansa6625]

1:40 "In the next hundred THOUSAND years." :(

[@benoit-pierredemaine3824]

An eye blink ...

[@bruhwtf2662]

Also the music stopped lol

[@kingsoonkit9234]

That caught me off guard

[@lizardlegend42]

But that could still be sooner rather than later

[@Hendlton]

Like he said, it's hard to predict. It could happen tomorrow.

[@rishwanthvidhya4261]

You shouldn't need to change your thumbnail and title to optimize the video for the algorithm, KZbin's algorithm needs to be changed. There was so much information packed into this 13 minute video, it is insane to not watch this video. Great work, keep it up!

[@vicrodrigues8228]

Anything about space blows my mind

[@pinehteshapple3666]

scientist are underrated they deserve more fame and a raise

[@Henchman1977]

I feel as though I actually understood this. Please don't ask me to explain it.

[@memeing_donkey]

explain it.

[@rugerbrooks]

But if you can't explain it then you don't really understand it? According to Einstein anyways. (Don't worry though, I don't really understand either!)

[@tservator8064]

Please explain it

[@aadarshraghuwanshi7022]

if you can explain it then you really understood it

[@ForestDewberry]

The gravity slows down the light. The light went in all directions, there were 4 lenses that redirected light back to us. We knew there were 4 lenses because the galaxy appeared in 4 different places. We saw the supernova in one of those places, ie from one of those lenses, then another, so we figured it's gonna appear the other place. somehow we figured out how long the delay was (maybe looking at how out-of-phase the rotation of the galaxy was in each image) and we added that to the supernova we saw to figure when we'll see it in the last image. @veritasium how'd I do?

[@AshishKaushik4994]

I was told, "if you missed an event you cant capture it again."

[@randal_gibbons]

That was Kodak's fear propaganda campaign used to sell more cameras.

[@irfanjames]

Unless if you are trillions of light years away from where that event occurred.

[@Bittertokken]

@@irfanjames you mean travel ahead at the speed of light so you can watch it again?

[@exorias625]

jokes on him i can see a sunset 3 times if im in dubai

[@Soken50]

Well, you can't, not even once, as all you really capture is electromagnetic echoes of the event, but provided you are at the right spacetime you can see other echoes of the event :D

[@caydeofspaydes]

I’m getting into astrophysics and astronomy, space is my special interest. My favourite stellar phenomena is the supernova - hell, it’s going to be my name once I transition. They’re so beautiful and so powerful, the very force of creation. The reason we’re here. Such a great thing to name myself after I think.

[@tigerstyle1014]

Fascinating stuff!! And kudos to all people who work so hard to unravel the mysteries of the universe