Submarine for Titan, Planets Changing Size, Even Bigger LIGO | Q&A 230

When does a Lagrange point stop being one? Can we make LIGO even bigger? Do planets change their size over time? Can we build a submarine to go to Titan? What's next for the TRAPPIST-1 system? All this and more in this week's Q&A!
00:00 Start
01:21 [Tatooine] Gravitational waves from The Great Attractor?
04:57 [Coruscant] Can LIGO's arms be even longer?
11:37 [Hoth] Can planets change their size over time?
15:17 [Naboo] Can we build a sub for Titan?
17:26 [Kamino] Most surprising discoveries from JWST?
20:37 [Bespin] Could we detect technosignatures from the Star Wars Galaxy?
23:21 [Mustafar] What's the core of Jupiter made of?
25:38 [Alderaan] What's next for the TRAPPIST-1 system?
28:19 [Dagobah] How much mass can a Lagrange point have?
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[@hive_indicator318]

Submarine for Titan>>>>Titan Submarine

[@MCsCreations]

Oh, I _sea_ what you did there...

[@nyyotam4057]

I hope they won't make this one out of cardboard.

[@emhome924]

They should make it out of Unobtainium..

[@Soepje]

​@@emhome924 It was made with einsteinium and ligma

[@doctorrobert1339]

Good god lmfao

[@generaldvw]

We just discovered Gravitational waves…and now we need the next generation detectors already😊…gotta love it.

[@joyeternal2314]

We have known about gravitational waves for more than 100 years. Einstein predicted ripples in space decades ago. It's only in 2015 we were able to detect them for the first time.

[@remcoh5793]

we've just learned how to see the waves in the sea of space-time

[@joyeternal2314]

@@remcoh5793 what? Please explain? GWs are not a recent discovery.

[@restitvtororbis5330]

​@@joyeternal2314A prediction/theory is not a discovery regardless of whether it turns out to be true. Einstein also THEORIZED that light was influenced by gravity, but we didn't 'know' it was true until it was tested a few years later. Even though all the physics research for over 100 years theorized that gravitational waves SHOULD exist, we didn't know for sure until LIGO was able to detect them and turn theory and prediction into scientifically tested and proven knowledge. Nobody ever says Einstein or schwarzschild 'discovered' Black holes even though they suspected them on paper because they were both dead long before they were observed, and this is a similar case. As for the recent gravitational wave discovery, yes LIGO was able to prove that they existed at all a few years ago, but now it was able to detect that there is also a 'background' of gravitational waves everywhere, like the sea, thus the reason that comment mentioned now being able to see waves in the 'sea of space-time'. Detecting one gravitational wave made the existence of the gravitational wave background a certainty, but until we were able to measure it we couldn't consider it to be a 'discovery'.

[@eamonia]

A submarine on Titan!? Cool. I just hope they don't make it out of carbon fiber 😆

[@michealthaarchangel5088]

Well you know that if the window starts cracking we'll have plenty of time to abort.😂😂😢😮😮

[@davidsabillon5182]

I'm actually more interested in exploring the moons of Jupiter with drones, rovers, submarines over landing humans on Mars.

[@gerulfdosinger9869]

You are not alone. I am of the very same opinion. Lets be jovian buddies. 😉

[@frasercain]

Jupiter's moons don't have an atmosphere, so drones wouldn't work there.

[@davidsabillon5182]

@@frasercain well I meant any type of robot, like a sub or Rover etc etc. Not sure what I would call that in general.

[@seasonedbeefs]

​@@davidsabillon5182it's a drone buddy

[@rhoddryice5412]

@@davidsabillon5182 I think the snake robot tested recently would be a good option for cracked moons. Or maybe something spider like.

[@MCsCreations]

Naboo! Thanks for the answers, Fraser! 😊 Stay safe there with your family! 🖖😊

[@JenniferA886]

Agreed 👍👍👍

[@davidguillen6611]

Thank you for all your hard work!

[@GrouchyHaggis]

Greta episode Fraser. Enjoy your break. Thanks Patrons!

[@ToomasVane]

Thunberg episode, Fraser.

[@GrouchyHaggis]

@ToomasVane aha, nice catch lol.

[@mhult5873]

Naboo ! My question: How are all the beautiful animations and illustrations made? Who makes them? And who made the very nice background music!? This channel and the videos are great, thank you so much Fraiser =) Take care! BR //M

[@ikkezelf599]

Titan Submarine indeed a sad coincidence.

[@cerealfamine1]

Lol

[@jimmyjasi-]

Excelent! Great Attractor! And Laniakea! The two most Romantic words known!(at least to me)!

[@peteredwards2318]

The Titan sub had better be better than the Titan sub. 😵‍💫

[@JayCross]

Thanks for taking my question! Nice answer!

[@douglaswilkinson5700]

Trappist's strong magnetic field -- 600 Gauss -- probably produces powerful flares that the planets are exposed to ergo less likely to harbor life.

[@shivamdodia5925]

Appreciate so much of the knowledge you share! On top of all of that appreciate your efforts, sir! 🤗💜

[@IDoNotLikeHandlesOnYT]

[Naboo] There's a new NIAC project this year (from a different team) about a Titan airplane that can skim the lakes for sampling. Also, the NIAC Symposium will be coming up in the next few months and, if it's like previous years, it should be free for the public to attend online-you can ask questions in the stream chat and they'll read them during the Q&A after each project's presentation.

[@JenniferA886]

Nice job… love the Q and A 👍👍👍

[@montyzx7r]

I love the dramatics of " its time for the question show..ur questons" ....and the calm, "my answers"..hahaha...

[@Iridiumalchemist]

So, in general, the way interferometers work- the longer the arms, the greater the sensitivity. Now, there is also a potential dependence on the wavelength of light and the synchronization of clocks on the instrumental arms. This being said, LISA should be more sensitive to small events and potentially quite directional depending on the exact configuration eventually implemented.

[@YYGC_Creator]

Great vid! Enjoy your summer.

[@andyc8508]

I enjoyed this. Love the lagrange question 😊

[@ChemEDan]

He never got to the point... pun intended

[@michaelginever732]

Sub's for Europa and Enceladus. Will be more difficult of course, but not impossible. The solution may be to equip them with some sort of nuclear powered ice melting 'nose'. The hole will probably just freeze up behind the vehicle but that is good because we have seen the water being ejected when the ice is breached. We wouldn't want the sub' just "spat" out of the hole the moment it hits the liquid water.

[@jensphiliphohmann1876]

17:10f (NABOO) When I hear/ read the words "submersible" and "Titan" together, I think of a catastrophic event.

[@pelewads]

Dude! You totally copped out on that last question. Define negligible. Really, really do love your channel

[@frasercain]

Negligible depends on the masses of the objects interacting. For Earth and the Sun, it could be a few km across. For the Sun and Jupiter, dozens of km across. For Earth and the Moon, hundreds of meters across.

[@MrRymax07]

See you next season when I'll join ❤your show it's something i never thought I'd enjoy it so much... Thankyou

[@rayreynolds7066]

(Alderaan) Has JWST got the equipment to detect bio/techno signatures for the Trappist system. i think the UT content over the last 6 months has gotten more interesting/thought provoking and the presentation is slicker. Hope you and the team have a great break.

[@chris-terrell-liveactive]

Thanks for another excellent QnA Fraser and have a great break. I have a question about possible "other earths" , some of the simulations that are shown have an Earth sized planet with much smaller seas, few or no oceans, and I'm curious how this would affect the habitability and likelihood of complex life arising, due in part to a reduced capacity to circulate heat around the planet, especially if it was also tidally locked to its star. Could this be another factor in the checklist for likely life/complex life (let alone technological intelligences)?

[@idodekkers9165]

Hey Fraser when lets say a black hole merger happens, are the gravitational waves like ones in a pond? where there are quite a few until the interference subsides, or is there one big wave and that's it?

[@joyeternal2314]

Hi Fraser. When gravitational waves pass through us, as they cause to stretch and squeeze everything in their path, could they cause any changes in us? I understand that the space itself is getting stretched and contracted.

[@Disasterina]

Great show! I vote Naboo!

[@Leafbinder]

Could we use a few of these circular strip mines to make antennas? I mean some are miles across so they would def. be big enough

[@Raz.C]

The end of another season, huh? So long and thanks for all the seasoning...

[@Flowmystic]

The only news I'm actively looking forward to weekly. Thanks a ton and I can not wait until September.

[@JenniferA886]

Same 👍👍👍

[@markhearne1102]

same here to.😭

[@brothermine2292]

What techniques would allow a much longer "LIGO" to deal with the Earth's curvature? Perhaps extra mirrors to shape the laser beam's trajectory? Or perhaps slightly curved fiber optic cable (instead of laser beam in a vacuum tunnel)?

[@ioresult]

I think Iapetus' equator is a good example of a shrinking scar.

[@RokStembergar]

Oh wow, i can see the future 😮

[@RokStembergar]

And it's beautiful ^_^

[@McBanditHope]

The Trappist drip feed is killing me dude.

[@olliverklozov2789]

Fraser with a little tinkering, title could be a haiku. I actually thought it was for a second. Would love to see you try to slip something like that in. 🙂

[@alan2here]

Would a spacecraft going to Jupiter benefit from pyrolytic graphite or bismuth parts?

[@vdiitd]

That title! It took me a sec to realize.

[@andrewlass1257]

Have a good summer UT folks!

[@Hooves1]

If the universe is expanding, do quantum lengths (eg the distance between an electron and it's nucleolus) increase as a result?

[@JamesCairney]

The "big rip" as the hypothesis was callled. I shall give no answer, I'd rather a more detailed answer from Mr Cain himself. Good question tho.

[@jimcabezola3051]

Mahalo, all of you, for another WONDERFILLED year of space news! Aloha...and enjoy your hiatus to the full! I see you again before I know it!

[@rhoddryice5412]

Dagobah. Most definitely even though a Titan submersible would be exciting.

[@terrybradford3727]

(Dagobah Segment) Have an awesome break/vacation. A potential question for next season, to keep with the Lagrange point motif. Would the Lagrange points be a great place for space mining? Maybe not our, but Jupiter sounds like prime real estate. Stable and predictable orbit, the mass similar to the asteroid belt. Of course, I also thought slamming an asteroid int the moon to mine it was a good idea, lol. EDIT: A reference to when this was on Google hangouts, lol.

[@WillYouVid]

Stoked about the Titan submarine idea and about robotic exploration of the solar system! There's a very informative and original article titled "Why not Mars" by Maciej Ceglowski, have you read it? It's on his blog "Idle Words". Do you know him? I would be SO happy if you had a word with him on the matter!

[@YTEdy]

I think the Lagrande mass range is only applies to the Sun and the Earth, not the Earth and the object at L4 and L5. In theory, a very massive object could sit at one or the other, but not both, even up to or above the mass of the Earth, but as long as it's much less massive than the Sun. I think the ratio from memory is 26-1, so even a Jupiter mass could work. They'd be co-Lagrange objects to each other. In a 3-body model, this would be stable indefinitely, though with eccentricity and orbital perturbations, probably still not a good idea.

[@Shizzlewish]

[Dagobah] Talk of Jupiter's LaGrange points filled with material brings to mind rich ore deposits for space mining... yes I played Eve Online lol

[@isaackitone]

Since we are orbiting around the milky way, couldn't we eventually end up on the same side as the great attractor in, say 100 million years? Or is the milky way also orbiting around that area and we will always be on the opposite end of it?

[@gptiede]

Yes. The Earth takes about 225 million years to orbit once around the center of the Milky Way galaxy, so in about 112 million years, the Great Attractor will be opposite the center of the Milky Way in Earth's sky, and it will only be a few 10s of millions of years before Earth will have completed enough of an orbit for the Great Attractor to be visible as it "comes out from behind" the center of the Milky Way. Unfortunately, both time scales are way too big for humans to wait.

[@olliverklozov2789]

Yes. The milky way is spinning like a top so in 100 million years a different part of the universe will be blocked from our view. We are being drawn towards the great attractor (attracted) but that would take billions or trillions of years.

[@isaackitone]

I'll wait. If it's just 10s of millions of years. That's not too much time for me.

[@Kitsaplorax]

If we had a cave system with a really long line of sight baseline we could use it for gravity and cosmic rays and muon observations.

[@alangarland8571]

Yes we can detect gradational waves. This might tell us something interesting about black holes and that ilk. I'm not sure how this information might be useful though.

[@X3MgamePlays]

Dagobah I really liked that question. I wonder about the maximum mass. But this could be calculated based on a 2 body system, right? *** How to get a question in?

[@alfonsopayra]

I vote for Bespin!!❤❤❤

[@robethendricks3523]

You may have covered this so excuse me. If there is a space time that can transmit waves, gravity waves, what is the medium that transmits those waves? Your answer can’t use space time as the medium because would be circular.

[@thebigerns]

Fraser, will we ever make gravitational mass maps of the universe the way we mae elevation maps of Earth today? IOW, will we map gravities other than black hole/neutron star mergers?

[@JohnMuz1]

Its All Good!

[@dustman96]

Submarine for Titan, yes please.

[@j7ndominica051]

I am only listening to it now that the hiatus has ended. Swimming in a methane sea would be scary. What if the ship gets cracked by the extreme cold.

[@mihan2d]

What would happen to a planet or a human if they were say relatively close to a supermassive black hole merger, where gravitational waves are really concentrated? Is it gonna have some destructive effects on the matter, or is it gonna stretch/compress everything including the atomic lattices and no one would even notice anything without instruments?

[@InfiniteCyclus]

Hi Fraser. Question: When Lisa is up in space wouldn't natural drift be a problem? Since these measurements need to be so precise how would they prevent small disturbances, like drift and small meteorites, from interfering with their measurements? Thanks..

[@IDoNotLikeHandlesOnYT]

I'm not Fraser, but I'm guessing they'll just use the same laser ranging system they already have for science for formation maintenance too, along with Earth-based Doppler tracking and maybe Earth-based time-of-flight ranging. IIRC, they're going to be equipped with FEEP thrusters, the most precise (in terms of minimum impulse bit) kind of thruster yet invented. The main perturbations will probably be from solar radiation pressure and Earth/Moon gravity, which can both be modeled pretty well. Any rocks larger than dust that hit them would probably just destroy them, but fortunately there aren't many of those-even the main belt is safe to fly through without having to avoid anything.

[@jimmytittle4848]

So I have a question..... Off subject a bit. But I'm curious how I have heard it said that one of the issues with light speed is that whatever ship you would be traveling in would have mass and "drag". So, if this is true, how is it possible for an interstellar meteor that's said to be traveling for billions of years hit our atmosphere at 130,000 mph? Wouldn't that same "drag" have caused it to stop eventually?

[@piotr2037]

Is it possible that at some fixed expansion rate of the Universe we would see the Universe at the same point in time? Regardles of how far we wold look.

[@abrahamsatinger265]

Instead of messages, act like a mirror and relay back to them what's going to happen, or both. Just wondered if you can test for temporal anomalies when the alien race sees what going to happen. Is that possible?

[@BfunT]

As dust is a big problem for our solar arrays on mars, wouldn’t it be possible to use the Ingenuity copter with its high rpm rotors to blow off some dust? Thank you and have a great summer!

[@CybAtSteam]

Perseverance does not have solar panels, it is nuclear powered

[@AbqHalsey]

❓would the rtg generator's heat melt the ice underneath the Titan helicopter?

[@CarFreeSegnitz]

Correct. An RTG on Titan would be like walking around Earth with a bucket of lava. Not so good at close-up observation as it melts its surroundings but kick-ass aerial photography.

[@spanglerimagery]

Cassini, as well.. They should make it a dual effort: one sub to each,.. that under ice ocean is too curious!

[@CarFreeSegnitz]

? Cassini ? was a spacecraft that was orbiting Saturn… until it was sent plunging into Saturn in 2017. Europa… maybe? Europa is a moon of Jupiter. Titan is a moon of Saturn. Not close to each other at all. Two different missions.

[@HPA97]

Coruscant Is it possible for star systems to periodically swap planets between themselves? I'm imagining 2 star systems orbit each other closely where one planet in the far outer parts of one system periodically switches which star system it follows.

[@ronakmist]

I'm sure there's a million Trappist questions, so I apologize in advance. Let's say we find an earth like planet in this system, what's next? Of the Earth's combined arsenal of astronomical instruments, what will we start pointing to this system and what will each of those teach us?

[@jeroenk3570]

How come that after waiting years for the first gravity wave detection at LIGO, they now can detect so many? Is it because they need a first detection to fine-tune the instruments or is it because of better instruments.

[@vidyaishaya4839]

Once we get space telescopes past Neptune, we can use the Sun asca gravitational lense. At that time we'll be able to see distant stuff at great detail. Give us a hundred or so years and we'll be there. Once we start building huge telescopes on the far side of the Moon, we'll be getting real pictures of exo planets. We're only decades from that happening.

[@CarFreeSegnitz]

Moon telescopes have drawbacks. The Moon has gravity that telescope mechanisms have to work against. Mirrors are heavy and so are the frames that carry them. There’s an upper limit before both sag against the gravity. No matter where you site a lunar telescope half the sky is denied to you. The Moon gets in the way. Free-floating space telescopes are the way to go. No gravity to warp mirrors or frames so we could build them as big as we want. But, of course, any telescope on the Moon or free-floating will be subject to micrometeorites. Free-floating telescopes could be aimed at any point except straight at the sun, the whole sky is available.

[@romeyjclark]

I thought the guy at 5:15 just had a really big pot belly till I went back and realized that's probably just wind on his jacket lol.

[@SuperYtc1]

Titan submarine. Fraser inadvertently clickbaiting. XD

[@tauceti8060]

If mercury is shrinking that means that the gravity should increase as its density increases.

[@davesilkstone6912]

Why is LISA only two dimentional ? Surely you need at least one arm in the third dimension otherwise you could miss out detecting gravitational waves coming in at right angles to the existing triangle.

[@larnotlars1717]

Dagobah!

[@olivergrumitt2601]

Any submarine sent to Explore the lakes of Titan would be uncrewed, so there is, thankfully, no chance of a Titanic disaster.

[@lgme378]

The gravitational waves are emited only by "massive" accelerating objects, the great attractor would not emit enough to be detected.

[@CarFreeSegnitz]

Object within the Great Attractor could be emitting detectable gravity waves. If we ever come up with X blackhole-mergers per galaxy per year and we detect 10x X blackhole mergers in a year from the Great Attractor then we could reasonably conclude 10 galaxies-mass in the Great Attractor.

[@seasonallyferal1439]

What happens when iron meteors hit Jupiter? Has any been able to estimate how much iron has collected from them?

[@gptiede]

As any meteorites fall into Jupiter they are accelerated to faster and faster speeds by Jupiter's strong gravity as they fall. As a result when they get to the atmosphere of Jupiter they are going faster than 60 km/s (about 135,000 miles per hour) and so when they hit the atmosphere they are vaporized into gas in a tremendous explosion. This was directly observed for the pieces of Comet Shoemaker-Levy 9 as they hit Jupiter's atmosphere back in 1994. This would happen for an iron meteorite just as it does for a comet due to the very vast collision velocity. The iron molecules would eventually sink into the planet and become part of Jupiter's core. I am not aware of any model of the amount of iron that has fallen into Jupiter, but the average composition of infalling material will be the same as Jupiter's composition, except for Jupiter's hydrogen and helium, so the core mass would very slightly increase but not enough to make any significant differences.

[@DaZAvocado]

I have a question for the QnA; ive read Artemis the book by Andy Weir and i was wondering is 2 six cm aluminium plates and a meter of crushed rock enough to protect people that would live on the moon, what about the 27cm thick glass?

[@frasercain]

A meter of rock is plenty. Or a meter of water.

[@DaZAvocado]

@@frasercain thank youu so much!! Good to know

[@DrDeuteron]

Glass can be leaded glass. Good for gamma, protons not so much

[@DaZAvocado]

@@DrDeuteron imma take your word for it, i really enjoyed the way the city of artemis was planned out so its nice to know its actually possible

[@Disasterina]

Oh, and how close to the speed of light do those quasars spin?

[@frasercain]

Like, up to 70% the speed of light.

[@CarFreeSegnitz]

@@frasercainAre there any examples of quasar-pulsars? Lighthouses for the universe!

[@petertaylor4758]

I think the earth must be growing because you have to dig down to get to dinosaur fossils or Roman walls etc

[@rogerwilco1777]

Can the sub ignite one of those lakes on Titan? One link says theres not enough oxygen, another link says the lakes might have been formed by nitrogen explosions.. so, what are the odds that a stray spark sets Titan on fire?

[@Hooves1]

Does the CMB assume we're at the center of the universe?

[@CarFreeSegnitz]

You are the centre of the universe. Everything you look at is in the past. From your vantage point the Hubble Expansion is moving everything away from you. But then everyone is the centre of their universe. If everyone is special then no one is special.

[@jamesfowley4114]

How much volcanic gas is released compared to how much material is gathered every day? How much gas escapes compared to both?

[@CarFreeSegnitz]

Volcanic gases are not a net gain or loss of Earth’s mass.

[@mrzoinky5999]

I don't understand how the L2 and L3 Lagrange points work - I can see how the pull from the Earth and Sun at the other points equalize, but at L2 and L3 it would seem that there is a net attraction in the direction of the Sun.

[@frasercain]

An object at L2 is a little farther from the Sun, so it should orbit a little slower than Earth. But the Earth's gravity pulls it forward. Similar effect to L1 and L3.

[@mrzoinky5999]

@@frasercain Thank you , that makes sense - I tried googling the answer for several hours with no luck

[@JuandeFucaU]

I'm pretty sure there are websites that specialize in white dwarves and black holes merging.

[@rajveerchampavat6757]

How much extra mass is needed to Jupiter to ignite it like a star?

[@aetoski8724]

100 tons of meteorites strikes a DAY??? I knew we get strikes but thats gotta Coolest fact I've heard in a while

[@frasercain]

We lose about the same amount of atmosphere too.

[@fathersondiecast6521]

Stockton Rush was unavailable for comment

[@davecarsley8773]

Consistency is *key* for youtubers and podcasters. Probably the most important part of growing an audience.

[@trollking202]

The Titan sun marine can go 4000 meter long walk under the sea 😮 if the carbon dioxide is not allowed 😌

[@dustman96]

Is there wind on Titan?

[@alan2here]

0:00 - 0:03 loony toons :)

[@nitricoxidegod]

👍

[@timpointing]

Blame for this video being somewhat "click bait" goes to whomever constructed tge "thumbnail" image for the video which proclsims in large red all-caps letters: "TITAN SUBMARINE". I dont believe that our beloved Fraser ever uttered that phrase during the actual video.

[@Nk36745]

How long until I can get a gravitational wave detector inside my phone?

[@doogle4144]

How did the term “population 3” come about?

[@andreaspeters8602]

good question. I´d like to know that, too. One should think when it´s formed from hydrogen and helium3 only, it should be called generation 1 star. Apperantly it isn´t.

[@timpointing]

Named by astronomers - the same people that gave stars that are brighter a smaller number [in Magnitudes] 🤪

[@aroyalduck167]

A Titan submarine... where have i heard of this before?

[@RhysOlwyn]

17:10 Well, you could send a submarine to the moon. I would be totally pointless, but it would be easier than sending one to Titan 🤪

[@D_Cragoon]

Hey where Fraser says bigger gravitational wave detectors may resolve the Hubble crisis, it would be kinda funny (in a Universe saying "screw you humanity" way) if it came up with a different third answer that wasn't anywhere close to either current proposed answer, so we end up with 3 competing answers.

[@vidyaishaya4839]

They will go with the new measurement no matter what. It's going to be way more accurate than any other measurements. The old measurements have huge uncertainty ranges. What's worse is they don't overlap, so we can't even make a guess.

[@D_Cragoon]

@@vidyaishaya4839 Well that's good to hear.

[@IapetusStag]

Hooray for a submarine to Titan! It's a shame that this moon's name is now connected to an unfortunate meme.

[@doncarlodivargas5497]

By the time a submarine are sailing trough an ocean on a distant moon no one remember the home made contraption that probably was meant as a one time use idea

[@IapetusStag]

@@doncarlodivargas5497 I hope. Unless it's Ricardo Milos or Angry Cricket Fan level meme that may even persist for a lifetime. lol

[@doncarlodivargas5497]

@@IapetusStag - anyhow, we can never get too many memes, so if it becomes a meme it might not be too bad