Neil deGrasse Tyson Explains "What Goes Up, Must Come Down"

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StarTalk

StarTalk

Күн бұрын

Пікірлер: 674
@ChrisSandtSmith
@ChrisSandtSmith 4 жыл бұрын
"What doesn't reach escape velocity, Must come down"
@Russia-bullies
@Russia-bullies 4 жыл бұрын
In what direction is down? 😀
@ChrisSandtSmith
@ChrisSandtSmith 4 жыл бұрын
@@Russia-bullies whatever direction is opposite from escape direction.... In other words, towards the gravitational force or "down"
@prakharanand7012
@prakharanand7012 4 жыл бұрын
@@ChrisSandtSmith what about a situation where all spacetime is curved towards one point Where no matter u go in which direction , u move towards that point😂😂(uk wut is it right?)
@ChrisSandtSmith
@ChrisSandtSmith 4 жыл бұрын
@@prakharanand7012 well, in that case there would be no escape, meaning no escape velocity, meaning what goes, must come. The other dimensions are then irrelevant. Lol,
@danishkhan198
@danishkhan198 4 жыл бұрын
@@Russia-bullies is giving a reference to a VSAUCE video and y'all gave him a lesson.
@johnl119
@johnl119 4 жыл бұрын
I love it when Chuck makes a discovery that was just explained by Neil.
@johnl119
@johnl119 4 жыл бұрын
I would react rhe same way...actually I do react rhe same way as Chuck
@tonemoreno763
@tonemoreno763 4 жыл бұрын
Chuck’s a great partner to have on these. Wonderful Comedic timing.
@NukasCafe
@NukasCafe 4 жыл бұрын
I honestly hate listening to him, hes not interesting in the slightest. At least to me
@techking55
@techking55 4 жыл бұрын
@@NukasCafe hate is a strong word... Chuck makes easy for simpletons to understand science 😊 thou he is a great and wonderful person with Humour
@munchiemac2895
@munchiemac2895 4 жыл бұрын
His comedy is garbage
@NukasCafe
@NukasCafe 4 жыл бұрын
@@techking55 its not that I hate him, I dont by no means. Occasionally he can be funny, but I come to listen to Neil and then you have Chuck who makes these dumb jokes that just gets old quick you know? Idk just preference I guess. I still like chuck but I think he should tone down his jokes honestly
@iamhighandwhatisthis713
@iamhighandwhatisthis713 4 жыл бұрын
I feel the same, he doesn’t seem to belong on these vids
@komranbehbehani6379
@komranbehbehani6379 4 жыл бұрын
Chuck makes Neil’s information sound less like a lecture and more like a friendly conversation between friends! I happen to like the conversation! Thank you guys!
@MrJim117
@MrJim117 4 жыл бұрын
I would like a T-shirt that says, “what goes up at 6.9 miles per second must come down”
@JD987abc
@JD987abc 4 жыл бұрын
How about a T shirt that says...”Now you can’t leave.”
@judsonkr
@judsonkr 4 жыл бұрын
@@JD987abc yous. "Now yous can't leave"
@MrJim117
@MrJim117 4 жыл бұрын
@@JD987abc you could put that on the back.
@GetawayFilms
@GetawayFilms 4 жыл бұрын
@@MrJim117 On the back of mine I want "I'm travelling over 7 miles per second, catch you never!"
@The_Becomings
@The_Becomings 4 жыл бұрын
@@GetawayFilms mmmm you're out of this world!
@jagdishgohel2577
@jagdishgohel2577 4 жыл бұрын
This refers to my confidence when I see Neil it goes up and when I see an astrophysics problem it goes down😂😂
@joe.s2596
@joe.s2596 3 жыл бұрын
Honestly, I love these short explainer videos more than the podcasts.
@gyozakeynsianism
@gyozakeynsianism 4 жыл бұрын
"That's pretty brilliant that people figured this out." "Yeah, it's called science." Lol! Great video
@obadaodeh1625
@obadaodeh1625 3 жыл бұрын
Through 8 months of covid19-quarantines, i have kept my self sane by watching the STATTALK channel on youtube, and i'm glad that i did, i learned alot, thank you guys for keeping all the space geeks updated.
@mpatek4696
@mpatek4696 4 жыл бұрын
“What goes up, must come down” Musk’s Falcon 9 rocket: Hold my fuel.
@orazmyratrejepgeldiyev1478
@orazmyratrejepgeldiyev1478 3 жыл бұрын
this made my day😂😂😂😂😂😂😂😂
@jamesmmcgill
@jamesmmcgill 3 жыл бұрын
**"Spinning Wheel" played**
@katiakatia2380
@katiakatia2380 3 жыл бұрын
Well, it will eventually fall down😄
@VoltisArt
@VoltisArt Жыл бұрын
Musk's last rocket: Hold my - Oh sh...!
@whackbag3606
@whackbag3606 4 жыл бұрын
I love you Chuck but nothing makes me happier than when Neil asks you to do Math & you look like you just seen a ghost.
@John_Fisher
@John_Fisher 4 жыл бұрын
Too be fair it was Neil, who gave Chuck a sarcastic eyeroll, that said "It's 96 minus 32 dude" but had forgotten that he had switched between different units and was wrong. While Chuck verbally flubbed, he knew that the problem as stated was that he had to deal with 96 mile/hr vs 32 meters/second and that the conversion wasn't something he could do mentally on the fly but could be worked out. As much as the dynamic is intentionally 'average guy' versus 'educated guy' to have an entertaining and interesting dialog, I think sometimes the 'average guy' isn't given enough credit.
@KatieCatWalker
@KatieCatWalker 4 жыл бұрын
It's how I look when he asks Chuck to do math but I take it like he's asking me 🤔😭
@oluwafisayo3676
@oluwafisayo3676 4 жыл бұрын
Now I understand "To infinity and beyond!"
@0osaka
@0osaka 4 жыл бұрын
There's another way to break this 'law'. "Cats always land on their feet" "Toast always lands butter side down" If you glue toast butter side UP to the top of a cat and toss them up, both laws cancel each other out and the toast-on-cat can't ever fall back to the ground.
@rebekahweber2413
@rebekahweber2413 4 жыл бұрын
Are you that bored during Covid? , 🤭😄
@birdoffire9
@birdoffire9 4 жыл бұрын
I love it. That is something I would say that's hilarious!!!¡!!🤣😅😂😂😂
@urduib
@urduib 4 жыл бұрын
That´s science mate. You solved 2 unsolvable problems by combining them. This should be taught in school
@urduib
@urduib 4 жыл бұрын
@@rebekahweber2413 Are you always SO SERIOUS. You must be the funny guy at party´s. Hey let me guess öO hmmm your nick name is trigger ? nooo Triggered among friends
@rebekahweber2413
@rebekahweber2413 4 жыл бұрын
@@urduib I wait for a moment and pounce. I get it from my cat. Timing is everything.
@shaan702
@shaan702 4 жыл бұрын
“One giant leap to get home” 😂 😆 💀
@ramkoushik_vlogs
@ramkoushik_vlogs 4 жыл бұрын
More accurate rephrasing can go like: What goes up might come down Or not
@GetawayFilms
@GetawayFilms 4 жыл бұрын
That is more like something you would write in religious text.. Vague and without proper explanation :D
@jeinnerabdel
@jeinnerabdel 4 жыл бұрын
@@GetawayFilms no, because although it was phrased without details, you can still prove it. Religion would still miss the last part.
@GetawayFilms
@GetawayFilms 4 жыл бұрын
@@jeinnerabdel Due to scientific progress we can prove it yes... But prior to humans EVER having the technology.. EVERYTHING came back down.. Yet the physics remained the same You see.. YOU cannot prove it, because you cannot create anything that reaches escape velocity, so all your experiments would conclude that EVERYTHING came back down
@jeinnerabdel
@jeinnerabdel 4 жыл бұрын
@@GetawayFilms dude... The whole thread was a joke... If you want to go serious, then the word *might* on OP's post invalidates the whole entanglement you are making.
@mxkaba
@mxkaba 4 жыл бұрын
Cue Vsauce music
@millefune
@millefune 4 жыл бұрын
Chuck owning Niel was great. "You said, '96 MILES PER HOUR,' fool!"
@AnonymousFreakYT
@AnonymousFreakYT 4 жыл бұрын
Regarding air resistance - this a very important factor in rocket launches. If you watch any orbital rocket launch, you'll hear the announcer call out "Max Q" - Q is the letter assigned to air resistance. Rockets are designed for a certain maximum load of air resistance, so they have to take this in to account. The faster something goes in a fixed air density, the more resistance it has. But the higher something is, the thinner the air, so the less air resistance. Max Q is the point that these two balance - while the rocket is continuing to accelerate, it has gone high enough that the combination of air thickness+speed produces the highest air resistance. Once it passes Max Q, the air is getting thinner faster than the rocket is accelerating. Note that the Space Shuttle was capable of accelerating too fast! It had to throttle DOWN before reaching Max Q to slow its acceleration. Then once it passed Max Q, it would "go for throttle up". Another common misconception is that space is "high up". It isn't. A large portion of the Earth's population lives closer to space than to an ocean. Live in Portland, Seattle, Chicago, Dallas? You're closer to space than to an ocean. The air thins out *REALLY* fast - conventional airliners fly at an altitude that has air pressure about one quarter that at Sea Level. Concorde flew at an altitude where air pressure was about 10% sea level. The SR-71 Blackbird spy plane experienced only about 5%. (Which is why Blackbird pilots wore what were basically space suits - they were being shot at, so if the plane lost cabin pressure, they would die quickly without a space suit.) It is possible to achieve orbit at only 100 km (62 miles, 328,000 ft) altitude - you're above enough of the atmosphere at that point that atmospheric drag won't produce heating from going orbital velocity. You are also still experiencing roughly 97% of the gravity at Sea Level, though! So if you just went straight up to 100 km, you would feel nearly the same pull down as on the surface. To stay in orbit, you have to be moving sideways fast enough that you're "falling back down" at the same rate as the curvature of the Earth is going away from you. That's all orbit is - going sideways fast enough to continually NOT hit the Earth. Yes, there is some atmospheric drag at 100 km - enough that if you were put in to orbit there, the atmosphere would slow you down sufficiently to cause re-entry within a day or two. But not enough to be a serious heating concern. (The lowest "commonly used" orbital altitude is 250 km - that's high enough for a spacecraft to remain stable for at least multiple months.)
@trippplefive
@trippplefive 3 жыл бұрын
If KZbin and this guy were around when I was in highschool, I think I would have enjoyed science more. I bet he had some great teachers.
@vassilismichalakis1830
@vassilismichalakis1830 4 жыл бұрын
Just to remind that acceleration is measured in m/s/s or m/s^2, what i mean is that m/s is the measurement of Dv, velocity difference or just velocity v. Also a=Dv/Dt=Dx/Dt/Dt=Dx/Dt2 (Dt squared) and thats why the measurement of acceleration is m/so, i mean seconds squared.
@michelerossi7121
@michelerossi7121 3 жыл бұрын
This channel deserves at least 7 billion subscribers
@s.p.7313
@s.p.7313 4 жыл бұрын
I'd love to see michael vsauce and NDT have a conversation.
@BattleBunny1979
@BattleBunny1979 4 жыл бұрын
vsause needs prep and editing, neil does this on the fly.
@shkambjaka7570
@shkambjaka7570 4 жыл бұрын
I dont think there would be much left to be understood after a video like that. You’d just need some alcohol and accept your life as it is.
@daniellaytonmusic9865
@daniellaytonmusic9865 4 жыл бұрын
@Townspeople C well that depends on where we are! And where are we? Are we really we? *10 MINUTE TANGENT*
@sphinxrising1129
@sphinxrising1129 4 жыл бұрын
Who do you think does the work for Vsauce? Someone just like NDT. Vsauce is not a know-all genius (DUH).
@mookdiddy418
@mookdiddy418 4 жыл бұрын
@@shkambjaka7570 right 😀😀😂😂😂
@madrooky1398
@madrooky1398 4 жыл бұрын
I already knew this, but still, getting such an entertaining refreshing of it is always nice. And i love to improve my english as a side effect.
@oliverknowledge1229
@oliverknowledge1229 3 жыл бұрын
Brilliant! Interleaved learning 8:01
@pozzowon
@pozzowon 4 жыл бұрын
Chuck catching an error on Neil's reasoning! Priceless!! Fastball is about 140 feet per second, so close enough
@RPIdemon
@RPIdemon 4 жыл бұрын
You guys have an awesome dynamic. Plus, I love how Chuck was like "uh uh uh..." and then called you out on not knowing baseball (even though Neil just had a baseball episode)
@renos4421
@renos4421 3 жыл бұрын
Every morning I'm watching this guy!
@Stick-a-fork-in-Gmorks-tort
@Stick-a-fork-in-Gmorks-tort 4 жыл бұрын
"Now yous can't leave" - An analogy of a black hole "Look at me. I'm the one who did this to you, remember me" - An analogy of super massive black hole
@seantratervel4885
@seantratervel4885 4 жыл бұрын
Pre-space statement: "What goes up, must come down" Earth: Yeah! Human: Not exactly Sun: Pardon? Voyagers, Pioneer 10 & 11: Leaving the sun Milky Way: Cool . How about 100000 light year? Human: Wait and see
@theseeingkarp7958
@theseeingkarp7958 4 жыл бұрын
You guys need more merch! I want to rep a startalk t-shirt!
@gyozakeynsianism
@gyozakeynsianism 4 жыл бұрын
I know right? Where's the Tyson/Nice 2020 shirts???!! Make America Smart Again!
@Josh-sh6sq
@Josh-sh6sq 4 жыл бұрын
South Sudan 🇸🇸 ❤️ star talk.
@makemoneynow5061
@makemoneynow5061 3 жыл бұрын
Your channel definitely deserves my subs!
@anandhugopan
@anandhugopan 4 жыл бұрын
So every object on Earth sticks to the surface of the Earth due to what we call gravity (less than escape velocity). But what actually is gravity? 1) Is gravity a consequence of curved space time due to Earth? 2) Or is gravity prevelant due to the acceleration of the earth through space along with the solar system? Is it both or What actually is the cause of gravity beacause it's not a force right?
@cirkular2042
@cirkular2042 3 жыл бұрын
*what goes up, must come down* Taxes: “I think not”
@mjj5704
@mjj5704 4 жыл бұрын
I implore you great gentlemen to talk more about lightning
@twonumber22
@twonumber22 4 жыл бұрын
I've wondered how big or bright lightning might be on some other big superearth exoplanet.
@ZULEEPLAYZ
@ZULEEPLAYZ 4 жыл бұрын
AMAZING CONVERSATIONS!
@innoventions9465
@innoventions9465 4 жыл бұрын
It all depends on which Discipline is being researched e.g. they were narrowing it down to altitude. 'What goes down, must come up' is similar depending on which field of conversation is on the table. Finance, medicine, career,...
@HellaUtube
@HellaUtube 4 жыл бұрын
Imagine the astronauts missed the moon's entry point and then got pulled back to Earth "Nooooooooooooooooooooooooo"
@sazuna4024
@sazuna4024 4 жыл бұрын
Well that would be funny but just for one second until you realize that they would be a bit dead. Or shooting somewhere into nowhere. After all if they wouldn't hit the moon they would still be moving through space in a straight line. That would be a case of feelsbadman now we are going to die oh welp. Stuff happens.
@gildedbear5355
@gildedbear5355 4 жыл бұрын
The first several moon missions were actually set up to do just that. They were on "free return trajectories" which means that if they didn't do anything when they were near the moon they would return to Earth orbit. The later moon missions did not use the same orbital paths because the free return limited the places they could land on the moon.
@projectjt3149
@projectjt3149 4 жыл бұрын
Apollo 13 has entered the chat
@ciberiada01
@ciberiada01 3 жыл бұрын
I really enjoyed this episode! 👍
@sherubd
@sherubd 4 жыл бұрын
absolutely enjoyed this episode.
@so_es
@so_es 3 жыл бұрын
I can literally get old just watching every neil de gryse tyson's video on youtube
@cduncan3713
@cduncan3713 Жыл бұрын
Up is any direction pointed away from the center of gravity, down is any direction pointed towards the center of gravity. Firing bullets in the air not only must you take air resistance into account but, also earth rotation.
@isatousarr7044
@isatousarr7044 3 ай бұрын
What goes up must come down" is a principle rooted in gravity's undeniable pull. In our terrestrial environment, gravity dictates the return of everything we throw skyward. However, in the vast expanse of space, this notion is challenged by phenomena like the orbit of satellites, where centrifugal force and gravitational pull balance perfectly. Could our deeper understanding of gravitational anomalies, like the ones near massive celestial bodies, redefine this age-old principle in ways that could transform space travel and exploration?
@Kirbykin88
@Kirbykin88 4 жыл бұрын
I love how NDT asked Chuck like 5 times what 96-32 is and then just gave up and gave him the answer 😂
@shreyanshupanda1219
@shreyanshupanda1219 4 жыл бұрын
Great video as always.
@mirjanakatalina591
@mirjanakatalina591 4 жыл бұрын
I just love Neil and Chuck!
@snowthemegaabsol6819
@snowthemegaabsol6819 4 жыл бұрын
Some clarification. To say the escape velocity of the "surface" of a black hole is the speed of light is kind of misleading, since it gives the impression that if you can go faster than light, you could escape. But this isn't considering relativity. In relativity, you have to consider something called a spacetime path. Normally if you map out every possible spacetime path you could take onto a graph, where every line is at some angle from the normal [which would represent rest velocity], those lines would form cones, with the vertex angle of that cone being 45 degrees. Those 45 degree lines represent the speed of light [the angle between each line and the normal would be a hyperbolic cosine of each one's length]. Everything inside that cone represent every physically possible place you could be at any given time. In other words, it's every place you can go to in your future. As you approach a source of gravity, your light cone skews towards it, which is why they attract things. When you reach the event horizon of a black hole, the only possible spacetime paths you could take are those that point inside it, or to travel at 0 velocity with respect to the event horizon. In other words, there is no possible path you could take that would allow you to leave. Once you cross the event horizon, every path points inward. Even if you could travel faster than the light speed, it wouldn't matter. Faster speeds don't give you access to other paths outside of your light cone, because each point on any given line could only ever follow the curve of a hyperbola, which is why spacetime diagrams use hyperbolic trig functions. Increasing your speed would still take you along the same path as light, which can't escape the black hole. TL;DR: Every possible direction you can take from the event horizon points into the black hole, so it doesn't matter how fast you are, you're going in whether you like it or not. Escape velocity is a purely classical concept. It works great for almost everything. Black holes and massless things are the reason there's an _almost_
@enquiryplay
@enquiryplay 4 жыл бұрын
Chuck is actually right to warn against firing a gun into the air. Between 1985 and 1992, doctors at the King/Drew Medical Center in Los Angeles, California, treated some 118 people for random falling-bullet injuries. Thirty-eight of them died.
@Johnny_0704
@Johnny_0704 4 жыл бұрын
A comedian and a scientist! A wonderful combination!!!😂😂
@Bahlzeron
@Bahlzeron 4 жыл бұрын
About the bullet's return velocity....I may be wrong, but on it's return wouldn't it accelerate (~9.8m/s/s) until it reaches terminal velocity (~170mph)... provided the bullet is falling stable point first, and not tumbling, bringing the top speed down a hair.
@James-ye7rp
@James-ye7rp 3 жыл бұрын
Hey Neil and Chuck, I am not sure where to ask this Gravity Question. People constantly talk about Gravity as a "Downward" Force. But, if gravity is an effect of mass, then Gravity, on Earth for example, is not directly downward, but an artifact of Downward Plus an Infinite amount of Angular Forces of Gravity because "The Earth" is not JUST below us. So, the question: "Is there an accounting of just how sideways gravity affects the relative downward force of gravity?"
@brenotm3337
@brenotm3337 4 жыл бұрын
I thought Neil was going to talk about Alan Parsons. "What Goes Up ..." what a great song!
@fabiomenezesvieira2802
@fabiomenezesvieira2802 3 жыл бұрын
"what goes up at 6.9 miles per second must come down" seems very catch phrase to me, i can't stop saying
@nimrodlevy
@nimrodlevy 4 жыл бұрын
Please, i beg you, mention measurements in metric too, its annoying to pause the video and goto the calculator and back... Many thanks in advance! I love show!
@pulkitmohta8964
@pulkitmohta8964 4 жыл бұрын
Acceleration due to gravity = 32ft/s² = 9.8m/s² Escape velocity = 7 miles/s = 11.2km/s I think Neil should just avoid using imperial units in his life altogether.
@jadecoley
@jadecoley 4 жыл бұрын
I have to pause and calculate too, on the positive side, it gets my little grey cells working hehehe.
@pistitoth1363
@pistitoth1363 4 жыл бұрын
Sziasztok ! Az ördög jobb és bal keze! Királyság! OK! Imádlak benneteket!
@BaronVonQuiply
@BaronVonQuiply 4 жыл бұрын
_"What Goes Up Might Come Down"_
@blasphem1a
@blasphem1a 4 жыл бұрын
What a beautiful day, Kurzgesagt and Star Talk uploaded a new vid
@killllllllllllllerrr
@killllllllllllllerrr 4 жыл бұрын
Man of culture, I see!
@John_Fisher
@John_Fisher 4 жыл бұрын
To be fair to those objects left on the moon and Mars, they did come down as well - it's just that they established a new 'down'.
@fromnorway643
@fromnorway643 4 жыл бұрын
Flat earthers are unable to grasp that since they don't even get that "down" here on Earth is towards its _centre,_ whether you are in Europe, America or Australia.
@EdreesesPieces
@EdreesesPieces 4 жыл бұрын
In that case, what goes up, must go up more, because everything that falls down on Earth is going up relative to the moons surface
@HotelPapa100
@HotelPapa100 4 жыл бұрын
8:59 "It's time we retired that statement" Alan Parson's Project begs to disagree.
@chrisbrowning360
@chrisbrowning360 4 жыл бұрын
The bullet stops spinning on the way up, losing all of its durability, and begins tumbling. It would never fall straight back down, except in a perfect vacuum
@criticalthought7527
@criticalthought7527 4 жыл бұрын
Yes, it loses its stability and has an even slower terminal velocity falling back to earth than it would if it somehow was directionally stable on the return trip.
@juanjaimes5821
@juanjaimes5821 3 жыл бұрын
Already knew that, but still needed to hear it from Neil.
@shaileshkris
@shaileshkris 4 жыл бұрын
2:55 Neil says ‘achcha!’
@immaculateon3
@immaculateon3 4 жыл бұрын
That Bronx tale tangent on black holes by Chuck was his best ever
@gyozakeynsianism
@gyozakeynsianism 4 жыл бұрын
Chuck Nice would be (maybe already is) a brilliant voice actor.
@noahl6595
@noahl6595 4 жыл бұрын
Thanks for that Video Can you do a video on how to calculate this stuff Hi from Germany
@JD987abc
@JD987abc 4 жыл бұрын
Chuck’s a card. Great reference to A Broncs Tail. Neil gave the best explanation of escape velocity.
@erromaissaeelhilali5121
@erromaissaeelhilali5121 4 жыл бұрын
Great video uploaded on KZbin👍👍
@GetawayFilms
@GetawayFilms 4 жыл бұрын
Please link me to it
@erromaissaeelhilali5121
@erromaissaeelhilali5121 4 жыл бұрын
@@GetawayFilms kzbin.info/www/bejne/q3zVkHaZlL6nnNE
@tylerjohnson1787
@tylerjohnson1787 4 жыл бұрын
I have a question! if Neil could explain, so how everyone has said if someone saw us through a telescope million of light years away. They would still see the dinosaurs, so people on earth looking for life far far away is the same thing. So could it be possible there is already life, but in our time on earth we don’t see anything yet because it’s so far away?
@eugeneoman
@eugeneoman 3 жыл бұрын
Props to Chuck for bringing in A Bronx Tale!
@pushing2throttles
@pushing2throttles 4 жыл бұрын
Follow-up question. For example with Apollo 13, or with Voyager 1&2 doing gravity slingshot assists how does that factor into the escape velocity conversation Neil and Chuck just had?
@kt420ish
@kt420ish 4 жыл бұрын
Chuck i love the "A Bronx Tale" reference. Awesome movie!
@narutokunn
@narutokunn 4 жыл бұрын
Why is the escape velocity of black holes the speed of light when light can't escape? If light moved just a tad bit faster, would it have escaped? Or is the 'speed of light' used as in its the max possible speed and hence there is no escape?
@criticalthought7527
@criticalthought7527 4 жыл бұрын
The speed of light is the same as the speed of causality. In other words; light can't travel faster than the universal speed limit. Nothing can, because mass increases with speed. It increases to infinity at the universal speed limit. I hope I got that right, as a lay person, from memory. Apologies if I messed up.
@DemonicTechnoWar
@DemonicTechnoWar 4 жыл бұрын
Okay. The saying would stay the same cause even if you reach escape velocity if another planet/moon whatever catches you in its gravity then you fall down so you are still going down, and even if you don't get caught by gravity in some way then once you reach space up and down disappear till you have a point of orientation.
@tindraerikssonpasic
@tindraerikssonpasic 4 жыл бұрын
These guys are so funny together.
@tuzuharurakutu
@tuzuharurakutu 4 жыл бұрын
Can I argue that if an object escapes Earth's gravity, it's already in space, where words like "up" or "down" do not have as much meaning anymore. Therefore, only "going up" will make you only "go down", you will have to get "outside" (by continuing to go "up", I admit) the bulk of Earth's gravity to "not go down". Just some overthinking on my part.
@TsarDragon
@TsarDragon 4 жыл бұрын
Isn't the escape velocity for a black hole be higher than light speed? And wouldn't the amount go even higher than that depending on the mass of the black hole?
@jd-xj3ew
@jd-xj3ew Жыл бұрын
My thought exactly. If light cannot escape, and if there's nothing faster than light... Then... There is no escape velocity, correct?
@crisalexcris15
@crisalexcris15 4 жыл бұрын
So the big question I have is, if point a lasers at a black hole does the light from the laser accelerate and when it reaches the event horizon surpasses the speed of light?
@VoltisArt
@VoltisArt Жыл бұрын
No. The speed of light (and all other energy) is the speed of the universe. It is _effectively_ infinity and requires infinite energy for mass to travel that fast, while this is just what energy does on its own. Due to timespace dilation, even light under acceleration (or deceleration) is going the same speed, but the space around it stretches or compresses to compensate. Star Trek calls this dilation "warp" and uses it to explain most of its faster-than-light travel, not including wormholes. They make the time traveled shorter by artificially dilating space around the ship thanks to antimatter and...magic, until we can figure out how to actually do it. The same timespace dilation causes gravity and light to bend around huge objects including black holes. (Planets only bend light a tiny bit via gravity.) While we can't experience such extraordinary effects directly, Einstein predicted them and orbiting astronauts have proven this on the small scale, as timepieces coming back from orbital speed are reliably behind previously synchronized Earth clocks. The clocks, astronauts and ship while going faster in space, went slower in time and are slightly younger than all of us who stayed on the surface. Explaining the black hole itself and what actually happens to anything entering it would be an entire conversation so I'll not go into it, but hopefully this covers your question about changing the speed of light. Sorry I'm very late to the party!
@kaiserkarlvankaiserwetter9061
@kaiserkarlvankaiserwetter9061 4 жыл бұрын
Well there’s also escape velocity so what goes in a block hole must come out ?! Up ? Down ? Left right ? Spin clockwise or counter ?! Goes like time forward must Also backward ?!
@Slavir_Nabru
@Slavir_Nabru 3 жыл бұрын
Surely you don't need to reach escape velocity to get to the Moon, or the moon would be on an escape trajectory rather than in orbit.
@joshuatheobald6536
@joshuatheobald6536 3 жыл бұрын
I love how when Chuck was asked the math problem, his answer was just reciting the problem back to Neil rather than answering it. lol
@hidayayusuf1029
@hidayayusuf1029 3 жыл бұрын
Smart huh 😂
@rusteshackleferd8115
@rusteshackleferd8115 4 жыл бұрын
@Startalk First - love all these videos. Second - age goes up but never down.
@theElrin
@theElrin Жыл бұрын
“What goes up…mustn’t necessarily come back down…spinnin’ wheel got to go ‘round” …yeah baby!
@justinlucas9055
@justinlucas9055 4 жыл бұрын
I've always loved science but Neil has made me so much more interested.
@ToyaF82
@ToyaF82 4 жыл бұрын
Fascinating
@vineethpathinenchil5528
@vineethpathinenchil5528 4 жыл бұрын
Is the bullet thought experiment accurate? I thought it would reach the 9.81 m/sec while falling back into the riffle and it won't further accelerate. Wouldn't it reach the terminal velocity?🤔
@criticalthought7527
@criticalthought7527 4 жыл бұрын
Their example was very ideal, he did say he was ignoring air resistance. In an idealized thought experiment without any outside influences besides the masses of the earth and the bullet, it could fall back into the barrel at the same speed it left the gun. Terminal velocity applies if we allow for air resistance and the tumbling attitude of the returning bullet. Thus in this situation the bullet's velocity when it hits the ground will be much slower than when it left the gun. Their are videos and webpages of experiments that try to demonstrate real terminal velocities of returning bullets, out there in the interwebs if you want to dive deeper into this cool question.
@vineethpathinenchil5528
@vineethpathinenchil5528 4 жыл бұрын
@@criticalthought7527 okay cool man 👍
@janmacek5672
@janmacek5672 3 жыл бұрын
This video raises more questions then it answers really
@diegofernandez4789
@diegofernandez4789 4 жыл бұрын
Genius as always
@clarkkelly5568
@clarkkelly5568 3 жыл бұрын
best duo
@aravindan476
@aravindan476 4 жыл бұрын
If I get one reply *Hi* from Neil Tyson, it will make my day
@pan4909
@pan4909 4 жыл бұрын
I saw chuck on tv last night, kinda fangirled
@botlovingbeard6708
@botlovingbeard6708 4 жыл бұрын
I'm totally lost at the "at infinity" bit. Is that time, distance, and where does it apply? Sorry my bad, I've watched it several times and don't understand the context.
@fulstaak
@fulstaak 4 жыл бұрын
Based on this information, and I know I'm throwing a curve ball here, but please explain how the Twin Towers were able to come down to the ground in 10.5 and 12.5 seconds, and how Building 7, a 47-story building, was brought down in 6.5 seconds. Because I still don't get it. All mostly at free fall acceleration. Falling onto their vertical axes, through the path of most resistance. At free fall. Neil, Chuck, you have the floor. You might want to interview Richard Gage on this one.
@SlickTim9905
@SlickTim9905 Жыл бұрын
There has to be a secondary force keeping you moving in the same direction as the Earth's surface otherwise you would always move in the opposite direction the earth is rotating in. My question is what does it take to loose rotational force but not escape the earth? would you then be able to fall around the planet while hovering.
@kofisarkodie9550
@kofisarkodie9550 4 жыл бұрын
Hello I have a question...if you take a Video of a light[beam] and fast forward or increase the playback time does that make the beam in the video move at speeds faster than light in the context of the video and not how it's perceived outside the video
@VoltisArt
@VoltisArt Жыл бұрын
All you did was change the time reference of the recording. Considering light travels the diameter of Earth in about 0.042 seconds, you couldn't build a screen large enough to display the speed of light in any meaningful way, even if you could photograph light itself, which you can't. Displaying it faster wouldn't be anything traveling faster. On top of that, you're limited by electricity, which moves at...wait for it...the speed of light, in whatever medium it's traveling. _All_ mediums are slower than a vacuum like space. You physically could not update the screen fast enough to _show_ the speed of light, even if you could make and power a screen that spanned the distance between Earth and the sun, across which light takes about 8.3 minutes to travel. The electrical speed delivering the signal for any given part of the screen moves much slower than light itself, and must spread from the point where the data is sent out, in a wave across the entire screen. Your astronomical unit-sized screen might take an hour to show one frame of your movie. (Rough guestimate on my part and probably massively generous for actual electronics, ignoring the resistance that would prevent this thing from displaying anything at this scale, no matter what kind of wires were involved.) The next frame takes another hour. Meanwhile, actual light just did 7.2 laps from the sun to Earth...and back. The old version of this discussion is swiping a laser pointer across the sky. That also didn't make light go faster, it just changed where it's (eventually) ending up faster than it could travel between two places, which is information, not energy or mass. Nothing traveled between the two target end points, only from the laser pointer to each of those places. Two people standing on planets at either end of that swipe couldn't know that they got that light at almost the same time, because they couldn't ever get information _from each other_ faster than the speed of light. The same applies for watering grass. You can easily swipe the stream from a hose faster than the water's coming out, but no water goes from where you started pointing, to where you finished pointing. It all came from the hose at the same speed. Even if we make the camera and video screen magical and throw out all realistic delay, it's still the same as the hose or laser. Two far-apart pixels lighting up quickly isn't the same as a "thing" traveling at that same speed. You can't beat the speed of light. No matter what.
@LyfSukz
@LyfSukz 3 жыл бұрын
So... would a ship be "leaving Earth" all the way until the point where it's "approaching Mars"? Or is there some intermediate point where it's just drifting? Or is it that it shifts from fighting against acceleration toward Earth to fighting against acceleration toward Sol? And if you "fell" off the ISS, would you always fall back to Earth?
@HuMansta001
@HuMansta001 4 жыл бұрын
The dynamic duo strikes again....
@danebeck7900
@danebeck7900 4 жыл бұрын
The bullet fired straight up falls back into the rifle barrel at terminal velocity... the velocity where air resistance equals the weight of the bullet. That's WAY slower than the muzzle velocity of the bullet exiting the rifle.
@shivamgagad5674
@shivamgagad5674 4 жыл бұрын
Thanks Chuck, very *Nice* jokes.
@sidsharma7383
@sidsharma7383 4 жыл бұрын
"Neglect air resistance" AH! took me back to high school :p
@epicswirl
@epicswirl 4 жыл бұрын
*How dare you use freedom units in a science video! You get him chuck! 😂*
@98Nedeljko
@98Nedeljko 4 жыл бұрын
First time on this show that I knew everything ahead of time because it makes so much sense
@waleedgaming4910
@waleedgaming4910 4 жыл бұрын
yes yes yes another explainer video. I wait for these with PASSION. Thank you Neil for spreading knowledge
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