Coldest Place in The Universe, Most Distant Solar System Object, Best Use for Starship

Coldest Place in The Universe, Most Distant Solar System Object, Best Use for Starship | Q&A 261

Рет қаралды 38,534

Күн бұрын

What is the coldest place in the known Universe? Which object that has a name is the most distant in the Solar System? What would be the best use for SpaceX Starship? How do satellites avoid collisions? Answering all these questions and more in this week's Q&A show.
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00:00 Start
00:24 [Andoria] What's the furtherest named object in the Solar System?
04:48 [Vulcan] How do satellites avoid collisions?
09:00 [Risa] Where did all the pictures of the Milky Way come from?
12:17 [Aeturen] Can astrophotography hobby be turned into something serious?
18:59 [Vendikar] Why does gravity work across vast distances?
20:11 [Remus] What's the coldest place in the Universe?
21:18 [Janus] What are my current obsessions?
25:56 [Cait] Why is space black will all the stars in it?
28:28 [Betazed] Did JWST disprove the all previously known astronomy?
30:20 [Cheleb] Is the Great Attractor moving away from us?
32:37 [Nimbus] Best use for SpaceX Starship?
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Пікірлер: 299

@alexcollins9513 7 күн бұрын

I particularly like the way you answer the question in a way that the layman can comprehend

@jamesdubben3687 6 күн бұрын

Vote for which you liked the best.

@videosbymathew 7 күн бұрын

If the Oort Cloud reaches about half way to the nearest star (Proxima), then presumably that star's Oort Cloud (or equivalent) reaches almost to the same degree... so maybe they touch! That would stir up a lot of interactions given the gravitational tugs. The Proxima system is smaller overall though, so maybe there isn't much of an Oort Cloud (partly due to the triple star setup perhaps).

@trevorhumphrey4479 6 күн бұрын

Hey Fraser, got a question for you: So we are going to de orbit the international space station in the near future. Could we instead send up some rockets, give it a boost towards the moon, then use it's components to start our moon base? This would save a whole lot of launching individual payloads from earth and give the astronauts an already functioning shelter to begin construction of the new base.

@uniontank7125 7 күн бұрын

I'm excited for Vera Rubin!

@Raz.C Күн бұрын

Keep it in your pants, dude! Anyway, I think she's dead.

@MENTOKz 7 күн бұрын

Fraser mad props on saying gimp love when people talk about open source software thanks

@frasercain 7 күн бұрын

Gimp is baffling but it's free. 😀

@jimmirow 7 күн бұрын

@@frasercain thank you for all you do!!

@jamesdubben3687 6 күн бұрын

@@frasercain I thought it was just me. When I figured out layers, I thought it was fantastic. All I did was calm down a sunset, but it the image on my phone, so I'm happy.

@chattywalrus8485 5 күн бұрын

@@frasercain Related to your videos in general: why are you so enthusiastic about astronomy, yet so bitter about astronautics? I get that the army and the black ops have to have the coolest toys and all of NASA's budget, but... still, why the low morale?

@chattywalrus8485 5 күн бұрын

@@frasercainP.S.: You're wrong! Our days on this planet are numbered. The Sun's getting angry. I know, "bold" statement. Still, what's with the "I'm happy never leaving this square metre" attitude? I'm a couch potato and even I find it unfathomable.

@CraigCholar 7 күн бұрын

What a great set of questions! The satellite one brought back memories from about 25 uears ago when I took up satellite tracking and observing as a hobby. It became obsessive for a few years before I reached a burnout stage, and having poorer vision with aging made me decide to rethink the whole thing. Anyway, I really enjoyed this Q&A session. Thanks!

@michaeljames5936 6 күн бұрын

That was a really lovely, thoughtful and kind answer in respect of Photography. If I'd been the one asking, I'd have been like "You don't get it. The coolest part of every hobby, and I've tried hundreds, is buying all the stuff- and never learning how to use it. Learn what I'm doing... FIRST??" As I said, brilliant answer.

@JAGzilla-ur3lh 7 күн бұрын

Aeturen. I always appreciate these practical questions and answers for amateur astronomers.

@AndersWelander 5 күн бұрын

Very cool to learn about cold places. I had not thought about it. Our fusion experiments by the way should be the hottest places within at least thousands of light years.

@lindajirka5020 6 күн бұрын

Love this recap. Please keep it going.

@EdwardHinton-qs4ry 7 күн бұрын

Q. Ppl seem to think Von Neumann probes are inevitable and the universe should be full of them, but only life seems to self replicate and we know nothing about how it works. So are Von Neumann probes another Star Trek dream like warp drive and transporters?

@notmyname327 7 күн бұрын

Wow, I haven't even finished hearing the first answer and my mind is already blown. I love the question show

@karllindberg 6 күн бұрын

#Aeturen - great tip to begin with processing already existing data. :)

@shanent5793 7 күн бұрын

Launch providers don't know every detail of the payload so it's possible to hide a satellite inside of or as part of another vehicle. It could separate after launch and move to a different orbit. Stealth technology like radar absorbent materials would make it untrackable or at least appear to be something else like debris.

@jimmirow 7 күн бұрын

Thank you for all you do!! Im a big fan and grstefully appreciative.

@JayCross 6 күн бұрын

The force of gravity and the force from charge both operate as inverse square law, but there are no particles with negative gravity to pair up and neutralize gravity.

@bjornfeuerbacher5514 6 күн бұрын

Indeed, Fraser should have mentioned this crucial point. I mean, his answer was not really wrong (because negative and positive electric charges neutralize each other, you have only dipole forces at long distances, and these indeed drop off much faster with distance than the force of gravity), but it was rather incomplete.

@weihaogao-vz5hh 2 күн бұрын

this is the first vedio I saw on your channel, immediately subscribed, your explaination was very clearly

@nathanaelcard 7 күн бұрын

I love this series! Question for you: What's the math on the thermal influences of rocket launches on the environment? How much would that change if we launch rockets as often as is proposed by musk, et al?

@abrahamroloff8671 7 күн бұрын

This. And not just this, but it's also not exactly eco-friendly to gather and store metric butt-loads of methalox as it is... Let alone blast it off.

@notoriousm.i.g.9467 7 күн бұрын

@@abrahamroloff8671 I agree, that's why we should use an orion style nuclear pulse propulsion to get stuff to orbit -

@EricJW 7 күн бұрын

I was curious about this too and did some rough math. Note I'm doing some simplification here. If you assume full reusability is achieved, then most of the environmental impact comes from the propellant used. The Falcon 9 uses kerosene refined from petroleum with a single launch burning about as much fuel as a moderately-sized container vessel does over 24 hours of operation (~200 tons). A Starship launch burns about 5 times that amount in the form of methane refined from liquefied natural gas. It looks like there are some 50,000 container ships around the world, so even if you assume only half are operating at the same time, you would still need something like 50 Starships launching per day to reach even 1% of the same impact. Of course, this is also a conservation of energy and matter question. Starship switched to methane, because it's a much easier hydrocarbon to produce artificially around the solar system than basically anything else. If we develop that process to the point where we're using it to fuel rockets on Earth from ingredients already circulating in the environment (not fossil fuels from underground), the energy and materials released burning the fuel is simply the energy and materials previously captured, so that part of the impact is negated. You still have concerns like where you're getting the power for cryogenic storage, but that just folds into the question of how environmentally friendly our power grid is.

@JamesCairney 7 күн бұрын

Seeing as the entire industrial revolution has only been able to change one hundredth of one percent of the gas in our atmosphere, I don't think a few rockets are worth worrying about. (Co2 levels have risen from 300 ppm to 426ppm, that is a 0.0126% rise in total.)

@tonywells6990 7 күн бұрын

Last year in the USA car owners used 342 million gallons of gasoline fuel per day on the roads. That is equivalent to about a million tonnes per day, or 3 million tonnes of CO2. A Falcon 9 launch uses 186 tonnes of kerosene and 312 tonnes of O2, or a bit less than 500 tonnes of CO2 depending on combustion. So the equivalent in CO2 would mean a launch of about 5400 Falcon 9 rockets per day!

@Djfmdotcom 7 күн бұрын

17:12 Very cool story about your dad! My mom’s family ran a small group of photo processing stores (as well as camera shops) in Colorado (Pueblo/Springs region). Grew up around photography of all kinds. This iPhone takes such good pictures it’s made me lazy lol. Time to invest in a new (to me) camera!

@Disasterina 7 күн бұрын

I vote Andoria - Great show!

@nomad77boss 5 күн бұрын

One more for Andoria

@BrunoWeiers 2 күн бұрын

Hi, Fraser, big fan for a long time! I was wondering if you notice any change in the pace of discoveries and evolution of astronomy throughout the decades you’ve been following it. And what do you expect for the future. Do you see it accelerating or maintaining a pace?

@GrouchyHaggis 7 күн бұрын

Cait - Great Question/Answer combo.

@rJaune 7 күн бұрын

Janus:: Great show, as always!

@WilliamAArnett 7 күн бұрын

Gravity and electromagnetism both decrease as the square of the distance. The reason the gravity dominates the large scale structure of the universe is because gravity is always attractive whereas electromagnetism is not.

@liamredmill9134 4 күн бұрын

Very good new questions

@jaredtbrush 6 күн бұрын

Vulcan! Can I vote for my own question!?! Lol love the channel!

@adventuresinportland3032 7 күн бұрын

I realize this is out of left field but your camera is fantastic and clean. Great image. May I inquire as to your general setup here?

@frasercain 7 күн бұрын

I'm using a Sony FX3 camera.

@adventuresinportland3032 7 күн бұрын

@@frasercain Thanks!

@CarFreeSegnitz 6 күн бұрын

Aeturen. I have some suggestions. Here in the Pacific Northwest we’re familiar with the Gold Rush, the madness of finding riches. Prospectors came from everywhere, probably escaping terrible circumstances and ironically probably entering into worse circumstances. A vanishingly few made any significant finds. The real winners of the Gold Rush were the suppliers, the guys & gals who sold the gold pans and shovels. Slow, steady, unglamorous. Astrophotography? I compare photographers, the image processors to the Gold Rush prospectors. The overwhelming majority will not find anything truly new. I suspect the real money is in supplying telescopes, cameras and teaching people how to do astrophotography.

@denysvlasenko1865 7 күн бұрын

Pluto isn't at "about 50 AU", its semimajor axis is 39 AU.

@MarinCipollina 5 күн бұрын

When the body you're comparing it to is 11,900 AU away, 50 AU is close enough

@AndrewBlucher 3 күн бұрын

19:34 No, the magnetic force does not drop more quickly than to the gravitational force; all the field forces drop with inverse square distance. My explanation (according to my memory of Physics from 50 years ago) is that the electromagnetic forces are balanced out by all the "competing" electromagnetic forces, some attracting, some repelling, and over large distances summing to zero. In the case of gravity, we do not see any negative gravitational force, that would be repulsion and might be produced by a negative mass. So gravitational forces only cancel in between masses; outside of a sphere encompassing both masses the gravitational force is greater than the force of any one of the objects, ie they sum. Happy to hear corrections :-)

@universemaps 7 күн бұрын

Pixel 4 can take a short timelapse that looks pretty cool!

@MaryAnnNytowl 6 күн бұрын

Janus! 😂 I'm exactly the same way about learning new stuff! Sure, I'm not the owner/writer of a science blog, never even got a chance to go to college, but I'm an old-timey polymath - wait, I guess that'd be polysci, LOL! Remus! I hadn't heard about the Boomerang Nebula and its being unnaturally cold (as far as our current understanding goes), so I'll have to find out more! About Andoria, those Far Far Out names could just _adverb up_ the "far" with very, really, even amazingly and staggeringly, LOL! For Aeturen, my opinion is that once you start to try to turn a hobby into an actual paying job, you are going to be dangerously close to destroying your enjoyment of that hobby, immediately. And if you no longer enjoy it, what is the freaking point? You NEED a hobby that you truly enjoy, or life will drive you crazy. ≈ × + × ≈ × + × ≈ × + × ≈ × + × ≈ Bummer below. If you don't want to be bummed, blue, and sad, don't read onward. You've been warned. 🤷🏽‍♀️ [About Patreon: i would LOVE to be able to give through Patreon, to you and ALL of the other brilliant people here, like Dapper Dinosaur, Anton Petrov, Gutsick Gibbon, Forrest Valkai, Brian Tyler Cohen, Luke Beasley, Meidas Touch, Glenn Kirschner, on & on & on... but if I even just gave at the lowest monetary level each one has, that's probably at least a week of food, and I just can't do that, being a disabled woman on her own after her soulmate left after 38½ yrs married. I WANT to, but I can't.] Sorry for the bummer, but you were warned. 🤷🏽‍♀️

@scottmedchill4210 7 күн бұрын

Remus is my pick for most fancy striking this week

@maGnetar333 7 күн бұрын

OORT cloud from Halo Universe lore : ONI facility where the UNSC INFINITY was built!

@garyswift9347 6 күн бұрын

Andoria. wow, you're really cranking out the great shows. Thanks guys. "Far x 10 to the n out"?

@Mr_Kyle_ 7 күн бұрын

Andoria! We need to put a lander or orbiter on Sedna for some deep ort cloud observations for thousands of years :)

@hatterson 4 сағат бұрын

I actually went on a bit of a Daniel Suarez kick a bit earlier this year and read through most of his stuff. Daemon and Freedom were interesting. I also really like Delta-v and Critical Mass. There were a few times in each of those where something would happen and I'd roll my eyes a bit saying "ok, it's a fun story, but obviously if something bad like that happened on a real space ship, the entire thing would just blow up"...but then IFT 4 happened and I sort of had to eat my words watching that forward flag. Anyway, if you liked his writing style, I'd strongly recommend the sequel to Daemon (Freedom) as well as Delta-V and Critical Mass which focus on asteroid mining/space industry stuff.

@mattwuk 6 күн бұрын

Nevermind the need for water and food on a moon base, #1 priority is an Eagle One Transporter Ship 😉

@VictorRoblesPhotography 7 күн бұрын

I love that book Deamon and the second part Freedom.

@notforglory4012 6 күн бұрын

11:56 : "we won't get a picture of the (full) milky way until we send a spacecraft hundreds of LY out" question: isn't it theoretically possible (although probably extremely improbable) that we can in the future find of series of gravitationally lensing objects that would form a light loop such that we can take a picture of the (full) milky way from earth (or a nearby space telescope)? that would be a picture of the milky way as it was millions of years ago, but still.

@perritohiker 6 күн бұрын

QUESTION! Over the years, we've heard talk of "space elevators", some sort of object in low Earth orbit tethered to our planet by some as-yet-developed super strong material (synthetic spiderweb, graphene, etc.). Has any thought been given to doing this on the moon? Would the demands of the tether material be the same or less? Is it at all feasible to do there?

@bjornfeuerbacher5514 6 күн бұрын

Read the article "Lunar space elevator" on Wikipedia.

@filonin2 7 күн бұрын

Remus The Boomerang Nebula is colder than the background because it is an expanding gas and therefore it cools off. It's expanding VERY quickly, 164 km/s. Same reason a spray can gets cold.

@frasercain 7 күн бұрын

Yeah, that's what I figured.

@benhicks997 4 күн бұрын

(nimbus) That is so fascinating

@Hossdelux 7 күн бұрын

I vote Remus. I didn't know that there are some places that are colder than others out there. My first thought was type 3 civ? Now I am sure multiple people have studied said galaxy and wondered why it is colder than its surroundings but thats wild to me.

@desmond-hawkins 7 күн бұрын

At 3:24 on comets that go up to 0.4 light years from the Sun at their apoapsis, that's about 25,296 AUs (1 AU is the average distance from Earth to the Sun, or 499 light seconds).

@vturiserra 7 күн бұрын

1:02 Far Far Out has an orbital period of roughly 700 years. As far as I know, Sedna is an object within the solar system which has a distinct name (that was the condition your questioner asked), and its orbital period is around 11,400 years, which means it's much much farther than Far Far Out.

@tonywells6990 7 күн бұрын

At the moment Sedna is much much closer than Farfarout.

@michaeljames5936 6 күн бұрын

The Furthest object. Viewed at 170 Au (Can't remember exactly), but is that its closest approach, or furthest point. How far out does it go, please? PS I'll look up the conversion of light-years to AU myself.😉. Love the channel BTW. I often wonder, if the net had existed, say in the eighties, would there have been enough 'Space' stuff going on, to have 'filled' your videos, or was it always this busy, but no media bandwidth to communicate it?

@Proxtor 7 күн бұрын

Ah a fellow BC coast islander who loves space.

@christiandesalliers4663 6 күн бұрын

Question : Considering that gravity affects time and that if we fell backward into a black hole and looked out into the universe, we would see the rest of time pass in front of our eyes, could you explain the timeline of the Big Bang? Specifically, what do the initial milliseconds and seconds represent? Are these durations as we experience them on Earth or as they would have been experienced in the early universe?

@frankmalenfant2828 4 күн бұрын

I have a question about the Equivalence Principle and Black holes : If there is no experiment you can do in order to tell when you are crossing the event horizon, then it means you could extend a long pole between you and the singularity and always have a clear undistorted line of sight with its end... even when it crosses the event horizon before you do. Wouldn't this mean that the light emitted by the end of the pole exited the event horizon to reach your eyes? If relativistic effects distorted or blocked the light, then it would mean we could run an experiment that breaks the Equivalence Principe. What am I getting wrong with this idea? Is it because the pole finds itself in a different frame of reference because of the gravity gradient?

@kadourimdou43 6 күн бұрын

What is the Vera Rubin designed for. Is going to be a general telescope, or does it have a main mission?

@thejoshr 6 күн бұрын

Hi Fraser! I know I’ve had a question answered before (thank you!), but I want to know if you think Starship will ever make a landing on earth with people in it. I just can’t imagine that ever being approved. And if not, then what’s the plan?

@Raz.C Күн бұрын

Hi Fraser Could you please explain further how tracking pulsars can reveal our galactic shape? Many Big-Much of Thank You.

@DavidGuillen-ji6kw 5 күн бұрын

What a nice guy!

@removechan10298 7 күн бұрын

If our oort cloud goes halfway to the closest star, doesn't their oort cloud come halfway to ours? I read this was disputed, but if this is real, could it impact the dark matter/energy equation, what if there is just a lot more matter between stars?

@MrMegaMetroid 7 күн бұрын

I would assume that it absolutely would impact the overall mass estimates we have, but to a negligible amount remember, dark matter isn't just missing material, dark matter also doesn't behave like regular matter. Its either not at all, or weakly self interacting. When watching galaxies or large clusters collide, you can observe how all the dust and gas essentially collides and diffuses because of it, while dark matter clouds pass right through each other with no observable interaction besides their gravity. If oort cloud objects where the answer for dark matter, we would see collisions and general disruptions of the dark matter fields as they pass through each other at least thats my guess. Maybe dust is more diffuse and thus more prone to interact with other dust clouds, while compact objects are point sources that have a much smaller chance of collision. then again, dark matter has alot more weird properties that just makes it unlikely to be unaccounted regular matter. Dark matter gravitational lenses have weird polarisation and other properties that normal matter wouldn't have

@ilollipop100 7 күн бұрын

Is there a plan to replace Hubble with another similar but updated version using Starship? I know there are other spectra craft being planned and worked on, but I'm interested in the optical...

@mechadense 7 күн бұрын

Most distant >perisol< named object?

@mattelder1971 7 күн бұрын

36:00 Pretty much sounds like the plot of the TV show Person of Interest. It seems so weird to me that with all of the current developments in AI, so many people have either forgotten or totally ignored that show. Nearly everything in that show is possible TODAY with current AI.

@frasercain 7 күн бұрын

Great show, especially once they really dug into the AI part of the story.

@andytidnits 7 күн бұрын

The most distant object with a name? That would be my dad.

@mikerleft 7 күн бұрын

That is so sad. I'm sure there are other cold, distant dads. You are not the cause. I wish you well.

@DasutinD 3 күн бұрын

@frasercain "Freedom (TM)" is the sequel to Daemon. It does go further! I read it back in 2011, a few years after reading Daemon. Daniel got my imagination going for one technology mentioned in the book, only to see it start to become a product two years later! I also recommend reading "Influx" by Daniel as well. It's a fun sci-fi read.

@frasercain 3 күн бұрын

I'm reading Freedom now. I'll let you know what I thought

@Silivrenwolfie 7 күн бұрын

Have scientists used AI, or some other method to process gravitationally lensed images to show the original object?

@gravelpit5680 7 күн бұрын

They use software, which is what socalled AI actually is. AI, in the way it's being used these days is a total misnomer, a deceptive buzz word. AI, the real definition, isn't possible. We are centuries away from that if it's even possible at all because it's definition depends on the concept of consciousness and freewill which arguably don't exist. They're an illusion produced by synapses, the wetware in our brains which isn't achievable with computer chips. It's like claiming you can build a competitive race car engine out of styrofoam

@VictorRoblesPhotography 7 күн бұрын

Hello, first question ever. Did the recent big solar flares, in May, affected the ozone layer of the atmosphere? Did they weaken the atmosphere in any way?

@frasercain 7 күн бұрын

Not that I've heard.

@michaeljames5936 6 күн бұрын

Re Photos of the Milky Way- maybe one day, we'll be looking at a picture of our home galaxy, taken, just before it became lost in the vastness, because 'Science Droid: Karl-Cegen-204-3.' thought an image of that 'Pale white spiral', might motivate us to care for the galaxy a bit more.

@pakuize 5 күн бұрын

Was watching a video about wh on another channel autoplay switched to this while I was working I was quite sure knew this voice ah the realization ofc it's Fraser whom I've been listening to for a few years on the Astronomy Cast.

@frasercain 5 күн бұрын

Hah, I hope you enjoyed it

@Matthew-by6vl 7 күн бұрын

@frasercain During the Apollo missions, when NASA was mapping the landing sites on the moon, how did they get the pictures back, as it was before digital cameras and Internet? Thank you and your team for the amazing content.

@arnelilleseter4755 7 күн бұрын

They did have TV back then so they knew how to send pictures and video through radio waves.

@EditioCastigata 7 күн бұрын

@@arnelilleseter4755 I guess it’s about the landscape with elevation prior to landing, when planning the mission. - Today we’d use photogrammetry, or radar. Back then they didn’t have the computing power (?), nor digital images, to fuse two or more images of the moon shot at different angles. That’s how I understand the question.

@arnelilleseter4755 7 күн бұрын

@@EditioCastigata They mapped the entire Moon with 5 lunar orbiters. I don't know how detailed the images were but you can absolutely do photogrammetry with old fashioned photos. You can also work out the topography by looking at shadows. For the later missions they also supplemented the data with photos taken on the first Apollo missions.

@stefanandersson7519 6 күн бұрын

Andoria We see the effects of dark matter on the rotation of galaxies, and we see galaxies with a lot of dark matter, and some with seemingly none at all - but have we seen dark matter affecting galaxy collisions? Do galaxy collisions vary in appearance based on the amount/distribution of dark matter in the galaxies involved?

@bjornfeuerbacher5514 6 күн бұрын

We have seen dark matter affecting the collisions of galaxy _clusters_. Look up the Bullet Cluster.

@ioanbota9397 5 күн бұрын

Realy I like it

@crispico4727 7 күн бұрын

Relative to their sizes, galaxies are far closer to each other than stars are. Why does the universe become denser on higher scales?

@hascanman3325 7 күн бұрын

Its already got a name. Hitchhikers guide to the galaxy already coined it. Its the restaurant at the edge of the universe!

@narrator69 7 күн бұрын

They better call the first base on the moon "Moonbase Alpha"

@NoNameAtAll2 7 күн бұрын

aeiou

@colemin2 7 күн бұрын

@@NoNameAtAll2 John Madden

@_TeXoN_ 7 күн бұрын

Elon Musk would call it base X

@leuk2389 7 күн бұрын

We're whalers on the moon

@Hossdelux 7 күн бұрын

If it just becomes Basecamp 1 I will be severely disappointed and will make a petition

@EditioCastigata 7 күн бұрын

#Aeturen: Listen to Fraser. I did buy years ago a telescope for astrophotography. As impressive as the experience was, it was short lived for me learning that I actually enjoy a good night’s sleep, the hobby not being compatible with a stressful work life and a partner with plans on weekends.

@AaronSherman 7 күн бұрын

What would be better for viewing in the infrared, a telescope on the far side of earth:s moon or a telescope on Pluto when it's facing the sun?

@andreask.2675 6 күн бұрын

What size of telescope would be required to see objects in the Oort Cloud?

@marknovak6498 3 күн бұрын

A lot of the direct we look in the sky, the light from the star is stretched out to infrared. As I recall the sky may aproach 30% 😊coverage with a lot of time stars with stretched out light spetrum.

@beastlysnippets 7 күн бұрын

nice show as always :) Nimbus btw. Question: The Milky Way moves with some hundred km per second. Gravitation 'moves' with the speed of light. Means, that the gravitational pull from f.e. the center does not pull us to the center, but to where the center was 26000 years ago? Means, the whole thing should pull us slightly backwards, as well as our own mass would pull all the others slightly backwards, trying to slowly stop the whole thing?

@denysvlasenko1865 7 күн бұрын

Good question, with a surprising answer. Since GR equations are non-linear, the moving object's induced spacetime curvature is not the same as the curvature from the absolutely the same object but standing still. The effect is such that distant objects "feel" attraction not to the object's location, but to a point some way in front of it. When this influence reaches those distant objects and they start feeling it, the moving object meanwhile moved EXACTLY to that point. So it all works out as if the object's gravity is "instantaneous" and matches Newton's gravity behavior, with "infinite speed of gravity".

@tonywells6990 7 күн бұрын

Gravity always acts at the centre of gravity of an object due to how the gravitational field works. This is called the 'non-aberration' of gravity. It is also true for other static fields such as electromagnetism.

@beastlysnippets 6 күн бұрын

@@denysvlasenko1865 oof.. that is.. weird. Gravity moves with the speed of light, but it looks as if it took effekt instantly.. at least now i don't have to ask myself, do i get pulled towards the Great Attractor, or does it get dragged towards my fat belly :D It makes no difference!!

@RubbittTheBruise 5 күн бұрын

The next find should be "Further Again", then "Moreso".

@glennscott8622 5 күн бұрын

How many ejected from the inner Neptunian Solar System but bound, gravitationally captured by the Sun, in situ formed, and unbound rogue planets are thought to currently be closer to us than Alpha Proxima but beyond Neptune?

@l.johnkellerii1597 7 күн бұрын

Andoria

@d.o.6769 5 күн бұрын

@frasercain Any updates on the 80 year nova? Will we all see it at once, or will there be early signals?

@frasercain 5 күн бұрын

We'll have an update tomorrow

@d.o.6769 4 күн бұрын

@@frasercain Yes! I just saw that. Thank you!

@heemanmcspeed 7 күн бұрын

Considering our predicted distance for Planet nine, it makes sense why we haven’t found it yet.

@oberonpanopticon 7 күн бұрын

If it’s out there, Vera C Rubin will find it

@Goatcha_M 6 күн бұрын

Does NASA still have the spare versions of Hubble and would it be possible to send them up with Starship (when its ready) as a cheaper and easier option than servicing Hubble? Maybe giving them even more spare gyros and a few other modern tweaks in the bargain.

@curtisquick1582 Күн бұрын

The electromagnetic force does not lessen with distance more quickly than gravity. They are both inverse-square-law forces with infinite range. The reason why the electromagnetic force does not seem to act over large distances is because it is a bi-polar force, whereas gravity is a uni-polar force. The electromagnetic force is both positive and negative and cancels out for normal matter composed in equal parts of electrons and protons. For almost all macroscopic objects, the electromagnetic force cancels out, from cells to apples, to planets, to stars, to galaxies. Since gravity is uni-polar it does not cancel itself out but only grows with more mass. This is why the weakest of the four known forces wins out over all the other more powerful forces.

@orpal 3 күн бұрын

Are we riding in the back of the Milky way? How long would it take us to do half an orbit of the supermassive black hole? Would we be able to see the great attractor easier?

@Hackanhacker 7 күн бұрын

17:38 ahahah thats so fun to see, Almost a similar telescop as mine and the exact same tripod xD Man its been Years I have that and never seen it elsewhere :P God I need To buy better lenses !!!

@ed4053 7 күн бұрын

Q: Is there a way to simulate/compute the movement of the milky way over the past x billion year then point our telescopes to where it was in the past and take an image of the past milky way from the outside?

@bjornfeuerbacher5514 6 күн бұрын

Since the Milky Way moves a _lot_ slower than the speed of light, there is no way that we would see the past of the Milky Way in the direction where it came from. That light has gone past us long, long, long ago.

@mikesully7212 4 күн бұрын

how often do objects fall directly into our sun from the outer solar system?

@bikepacker9850 7 күн бұрын

Every so often I see a fact that makes me realise I AM OLD..... The latest fact to do this is my realisation we are closer to the next visit from Hayley's Comet than we are from the last visit.

@nunofernandes4501 5 күн бұрын

So we finally know where aliens keep their beer, Boomerang nebula! It didn't take a Dyson Sphere to find them, after all. Holy cosmic cooler, Batman!

@bucko4597 7 күн бұрын

Dr. Cain; What if we divided the known universe from our Sun to Proxima, then our Sun to the next closest object, then our Sun to the next closet object, so now we have 4 quads, all touching one another in someway with Gravity. That's how Space works, correct? Therefore, for quadrants 3 and 4 still affect our Sun, correct, because of Gravity? Now, we just have to find the closest objects in those sectors, that have enough gravity to touch the edge of our Sun system. right?

@MichaelWinter-ss6lx 7 күн бұрын

But that is only two dimensional. You need two more directions, to make it three dimensional and get some accuracy. Still not sure what you want to point out. Gravity? It's not a force. It is the topography of our 4D-universe. Thats why these six directions affect us, but they do change with time passing. Its a dynamic topography.

@filonin2 7 күн бұрын

He's not a doctor.

@bjornfeuerbacher5514 6 күн бұрын

"all touching one another in someway with Gravity" What is that supposed to mean? "That's how Space works, correct?" Err - no? "Therefore, for quadrants 3 and 4 still affect our Sun, correct, because of Gravity? " Pardon?!?

@dmondot 7 күн бұрын

So, @20:57, it's safe to say that the Boomerang Nebula is the coolest place in the Universe because it's the coolest place in the Universe... Also, @27:00, sure, the reasons the sky is black is that the observable universe is finite in time and space, and that the distant light has been shifted toward infrared, but there is a third reason. The interstellar space isn't empty. Even though there isn't much matter at all, the little matter that is there might absorb some of that light, and that small amount becomes significant over thousands of light years.

@frasercain 7 күн бұрын

No, we have much colder places on Earth than in the Boomerang Nebula.

@Bryan-Hensley 6 күн бұрын

@@frasercainI was wondering if you were talking about sustained or all time.

@bjornfeuerbacher5514 6 күн бұрын

That little matter that absorbs light heats up and then emits light itself, so this is _not_ a reason why the sky is not white.

@dmondot 6 күн бұрын

@@bjornfeuerbacher5514 Yes, it re-emits light, but typically more in the infrared, and a lot less in the visible spectrum.

@rulesofimgur 6 күн бұрын

10:24 okay, byt my house is 1/12 of an inch bigger on the inside than the outside. is this because of relativity? /s

@SinaFarhat 7 күн бұрын

I vote Risa.

@InsoundHbyJayWorthey 7 күн бұрын

Would it be possible to Re-Energize/Activate Mars Magnetic Field? I don’t see how Terra Forming of Mars could be feasible without the protection of a Magnetic Field 🤔

@bjornfeuerbacher5514 6 күн бұрын

NASA has some interesting ideas on that, try looking on its website.

@tyrport 7 күн бұрын

How about Far3out ?

@runningray 6 күн бұрын

Cait. "it's full of stars" Apparently there is still room left in the universe.

@cargorunner9960 7 күн бұрын

Question: Is it a bad decision to send humans to the moon when humanoid robots are becoming so advanced. They seem to offer most of the capability and flexibility offered by having a human on the moon. And a robot mission would be a fraction of the complexity and cost of a human mission. It would be interesting if SpaceX sent some Teslabots to the moon when performing the empty test run for the Starship Human Landing System. It seems a waste to land an empty star ship on the moon.

@MichaelWinter-ss6lx 7 күн бұрын

19:00 min. Gravity is *not* a force. Gravity is the topography of this universe. It shapes our universe in four dimensions; perhaps more dimensions, as nobody knows yet what DarkMatter is. Same goes for DarkEnergy. If we never find any particles associated with DarkMatter, we should consider it as indicator for other dimensions. Perhaps we can never find out, before FTL drives are found.

@filonin2 7 күн бұрын

Dark Matter is simply matter that does not interact with the EM spectrum, which implies nothing about other dimensions.

@bjornfeuerbacher5514 6 күн бұрын

Gravity can in most circumstances, without any problems, be treated and viewed as if it were a force. For that question, it was no problem at all that Fraser treated it as a force.