Double Quasars - Deep Sky Videos

[@AClockWorkKelly1]

So delighted to see Prof. Gray once again. Always one of my favourites.

[@Njald]

I love how she always feels like she is describing something she is proud of. Like the joy of mastering a difficult musical piece or solving a tricky puzzle. Or a teammate celebrating the other player when they score. Or a parent looking a their child doing something awesome.

[@Wanttofanta]

Absolutely. It’s been a while :D

[@zzzaphod8507]

Yes, we're lucky to have another video from Prof. Gray!

[@ricardoalves3475]

Very, very interesting! The idea that we can see the same distant object separated by 14 months of age is amazing!

[@johnh539]

Yes at the speed of light what a staggering extra distance it has travelled. As a Scot the song "You take the high road ,and I'll take the low road" comes to mind.😀

[@alandyer910]

Great to see Dr. Gray on camera again. Always a fine presentation! Thank you from Canada! 🇨🇦

[@robertpietschmann8287]

Great theme and well explained! But most of all: Good that you are back, Professor Gray! 🌌

[@bippythe]

And, roll gravitational lens credits! Nice touch...

[@Hobo_X]

Been a long time since I've seen Professor Gray!

[@kasnitch]

Fascinating . I have to admit I really want to see what is going on out there at present day and is very irritating I am at least 10 billion years behind the curve . A paltry 70-80 year average life span is not cutting it .

[@benoitb.3679]

Hello again Professor! I'll have to watch this later but I am super excited :)

[@productivitysharma3455]

Keep uploading these kind of videos please 🥺❤

[@Sinnistering]

I'm kind of digging this style of using objects to explore phenomena. This sometimes happened in Messier, but it felt, well, boring at times with how many open and globular clusters there were. (That said, I'm still extremely grateful you stuck to it because it also forced them to find new things to talk about for a relatively boring class of object, and I learned a LOT about the measurements and math done in astronomy from this channel!)

[@bierrollerful]

Gaia is such an exceptional mission. It keeps finding so much cool stuff.

[@evanherk]

Good to have another video from prof. Gray! Have been waiting for you to appear again in this series.

[@evanbasnaw]

I always find it incredible when there's an object so massive it can warp space enough to show a quasar double image, but still isn't bright enough for itself to be seen (black holes excluded).

[@038Dude]

Oh wow, havent seen you in a while, Prof. Gray is awesome, I can listen to her all day. I love the way she explains things.

[@michaelcollins966]

Good to Deep Sky Videos still going

[@edwardp7725]

My only complaint is that you guys dont upload enough! I cant get enough of these!

[@trickyd499]

Incredible, thank you Brady

[@srb20012001]

Prof. Gray is an excellent presenter for the lay public.

[@Corwin256]

The final summary is one of those perfectly simple yet somehow sublimely eloquent descriptions. "That's cool!" I agree with you, Brady. That is indeed really cool.

[@jaspertuin2073]

Gravitational Lensing has got to be one of the coolest things happening out there in space. Kindoff like those funny mirrors at theme parks but on cosmic scales!

[@slavkovalsky1671]

Ooooh great phenomena and explanation. The end credits effects were a nice touch )

[@zapfanzapfan]

Professor Grey is now a very apt name 🙂 Always lovely to see and hear from.

[@peterrollinson-lorimer]

Truly astonishing, and well explained for a layman such as myself. The one shock I received was your first mention of, I believe, supermassive black holes. Being hard of hearing, I use captions, which clearly spelled out "supermassive buttholes".

[@pamelawhitfield4570]

Another interesting video 👍 I managed to split QSO 0959+561A&B a couple of years ago using my mono CCD imaging rig in the backyard. It's not the most spectacular image I've ever taken but 6 arcseconds is doable even with my modest setup if the seeing and technical ducks line up properly on the night.

[@markzambelli]

More from Prf. M Gray... fantastic, both for the host *and* the subject

[@nobel.z4266]

Ah, I miss Dr. Megan Grey she was my advisor and she was amazing and kind 😢

[@Ana_crusis]

Hurray! New videos seem to be slowing down these days. I'm always glad when a new video comes out

[@dahemac]

Great video. Great professor Gray. I hope her Christmas cactus is safe somewhere.

[@kahazaba]

This is amazing. I am speechless 😮

[@thebrookshome]

I love seeing another Deep Sky Video!

[@robertbloch1063]

"that's cool" - understatement of the season 😆 That is mind-blowing!

[@SolaceEasy]

Dr Gray elucidates well.

[@Chlorate299]

Huh, so that red fuzzy bit is actually a galaxy _in front of_ the quasar from our perspective, but its gravity has diffracted the light from it to make it look like it's behind or part of another quasar. Neat.

[@Nahvi_PoE2]

Really enjoyed this one!

[@rillloudmother]

Yay, it's Dr. Meghan Gray, Double Quasar all the way!

[@bluzengoose472]

less than one minute in, and the BEST and CLEAREST (for my science illiterate mind) definiion of what a Quasar is. Thank you Prof Gray!

[@mogadeet6857]

That is such a good explanation. 👍

[@michaelogden5958]

14 minutes. That is quite amazing!

[@fewwiggle]

months

[@Stormgebieder]

4:53 The gravitational waves of its merger are already billions of years traveling trough the universe; who or what will be around they get 'here'?

[@Ishanaroya]

Nice! I want to hear more about these.

[@zzzaphod8507]

In the plot at 6:32, there seems to be a peak at 6363 angstroms in the lower plot but not the upper. Is that insignificant?

[@azdgariarada]

Nice lensing effect on the credits.

[@helvio89]

Best channel ever

[@ArchDudeify]

Woot 😎 new videooooooo 🙇‍♂️

[@cliveroberts415]

Beautifully explained, even I understood it.

[@jake_a_g]

That is actually so rad

[@conanobrien1]

So if you miss something on the 1st "viewing", you can watch it again in 14 months. Instant reply.

[@fatbackjak]

I enjoyed this video and found it very interesting.

[@PetraKann]

So how can we distinguish between a genuine double quasar and one that is an optical illusion with time delays and other cosmic artifacts?

[@fewwiggle]

If the spectrums are 'identical' (with 'identical' elemental fingerprints), then it is assumed that it is the same object, i.e., an illusion of two objects. Also, a part of that identical-ness can be 'identical' red-shifts -- the speed that the object(s) are moving away from us.

[@PetraKann]

@@fewwiggle Your little fairy tale is very hard to believe Mr Bullwinkle

[@kidmohair8151]

Brady nails it! that *is* cool!

[@tinyderppotato5410]

professor gray & quasars, it's a good day!✨

[@galaxia4709]

How far away is the 2nd object? Cool that the light arrived 14 months later!

[@MeshFrequency]

My mind just exploded. very cool

[@reidflemingworldstoughestm1394]

What an amazing job she has.

[@iugoeswest]

Very cool.

[@curiousuranus810]

Brilliant.

[@kentscoffey]

You lost me. Are the first two items you talked about 2 separate, distinct dual galaxies and the third item the single galaxy split by gravitational lensing OR were the first two items just incorrect hypothesis of the real single galaxy split by gravitational lensing?

[@fewwiggle]

They believe that the first pair is a true binary pair of colliding galaxies (each with a quasar at its center). The second pair appears to be just one galaxy/quasar seen doubled due to gravitational lensing.

[@luudest]

How come the time difference is only 14 months? compared to the 10 billion light years traveling time??

[@fewwiggle]

There is only a 'slight' bend in two otherwise straight paths. That 'slight' bend difference is 14 light MONTHS as compared to the overall straight path of 10 billion (10,000,000,000) light YEARS.

[@robbes7rh]

So we are seeing a double image of one object, and that object is a galaxy with an accreting black hole at its center?

[@fewwiggle]

Yes, for the 'pair' in the second photo. But, as she said, there are hints of an intervening 'normal' galaxy in the second photo, and that intervening galaxy is what is splitting the light of that more remote quasar. {Quasars are (massively) accreting super-massive black holes at the center of galaxies. And, the resulting accreting 'friction' leads to incredible luminosity.}

[@scottwatrous]

It's really cool that lensing such as that can actually be asymetric. I for some reason assumed that for us to see it, the paths would have to match up very closely. But i can see how if you had a galaxy in the way, some rays are taking the longer trip to get around it before they also happen to bent onto the collision course with Earth

[@droppedpasta]

Very cool

[@stoatystoat174]

I love Gaia

[@klausolekristiansen2960]

If they are identical, why do they look so different? One is blue and one is red.

[@bazpearce9993]

Explained in the video.

[@fewwiggle]

You are seeing hints of the intervening 'normal' galaxy that is splitting the light of the quasar.

[@AlexCFaulkner]

That's cool!

[@CookingWithCows]

That's quay quay

[@Corvaire]

Amazing comparison. ;O)-

[@u32_nekomata]

Why don't we ever hear your channel talking about the "stolen valor" or the first black hole pictures? Andrew Chael was the one who made this possible, not Mrs. Bouman. I know of his redaction video that he probably did out of white knighting, but the code does not lie. It was Mr. Chael who made the first picture of a black hole.

[@tigertiger1699]

🙏🤯

[@kevinhanley3023]

Enjoy both ends of the camera

[@CodyGall]

It’s still not as cool as a type zero civilization, harnessing all the resources of a planet, including human resources.

[@kennethkatz6782]

Supermassive blackholes or 2.50618414? Geocalculator.

[@toolbaggers]

Much more interesting than Jesus.

[@WeeWeeJumbo]

OMG it’s Doctor Gray, where you been? please collaborate, somehow, with @acollierastro