Do you think an alien civilization could evolve on a Moon? Let John know below.

Thanks for having me on to share our latest research!

Oh god, two best sleep inducing voices on youtube together, just as I'm going to bed. This is going to be bliss, but I'll have to listen to it again in the morning for the actual content.

Another great episode with two of my favorite science KZfaqrs!

I know a lot of people comment on how JMG helps them get to sleep, but he and his guests are always far too interesting for me to doze off. Two of my favorite channels and such thought provoking discussions!

One time in the future I will get an episode with the Grand Trio of science driven content creators John, David and Isaac

great episode JMG! you guys have great rapport and the content always leaves the listener giddy about the future. I hope Dr. Kipping is a regular guest (like once every few months once JWST starts getting results???)

All planets are planets! Anything massive enough to overcome rigid body forces in its core is a planet. Just like anything big enough to ignite fusion in its core is a star. Great episode!!

It took awhile for me to get used to David's way of speach but once you do (once I did), listening to him answer questions and unmix all the parameters, is just wonderful.

"Moon" and "planet" is like "boat" and "ship". A boat can be hauled onto a ship. If an aircraft carrier can be hauled onto a larger craft, it becomes a boat. If an Earth-sized body orbits a larger body, it becomes a moon.

I appreciate David Kipping and his KZfaq channel.

Cannot wait to hear this one tonight as I doze off. Two of my fave science channels here, Isaac Arthur up there too! Thought provoking and brings back my youthful sense of wonder, I have never even contemplated life on Moons! Very excited for this one, thanks Event Horizon and Cool Worlds!!

Hey, John. Verry happy that you invited this inspiring astronomer. Fan of both of you!

I quite like both of your channels, you both host some of the most informative astronomy talks on the cutting edge of research. Thanks for the talk!

The biggest issue of studies like this is that sometimes it's not one moon, but a couple of them... So, sometimes the orbits are going to align, but other times it won't. I mean, you could get a positive result in a few orbits, but not always... Pretty difficult indeed! It's a massive work! Thanks for the interview, JMG!!! 😊 Stay safe there with your family! 🖖😊

Imagine a system where there's life on both the planet and it's moon That Would be very intresting to see Specially if they developed independently of each other

Finally! I get to hear an answer to my question I have wondered for years… can moons have moons and what would they be called… although I was leaning more towards a word like a “moonlet” kind of like we say piglet for a baby pig 🐖 😂 What an awesome discussion to listen too. Thanks so much!

My Two favourites of KZfaq. Perfect

One of my favourite people to listen to. Hopefully Nick will be back on again soon?

Dr Kipping and Jean Michael Godier in one podcast 😍😍

Love your channel! I've learned so much and it's incredibly entertaining. Awesome!

Really enjoyed this episode. Can't wait to until the second episode.

About time you two had another chat!

Avi Loeb: 'You should talk about aliens instead. There's more money to be made.'

Always my highlight of the week. And there are people that say don’t get your information off KZfaq. There are many you tubers that provide excellent quality blogs. And with more info that traditional media.

More please! this may be ‘ASMR-ish’ but it is also very interesting and intellectually engaging. I love Thursday night because of this channel.

So excited for this!

This Will be a great one to listen to, as always. Thanks so much. I wish you All the best.

Thanks. I'm already subscribed to both channels! :) I think Dr. Kipping's work on exomoons is vital - not only in & of itself, but also because pushes the limits of detection, and will thus reflect back onto exoplanet research. tavi.

I’m so happy to see professor Kipping on the channel again!

I can't belive I missed this yesterday,,, and it's Dr. Kipping, John again you really have some of the best guests in sience youtube :)

Just Saw Anton's video dealing with this also. Theia really made Earth and the Moon almost a two planet system. If we were hit by a Venus size object. Forming two small Earths out of a Super Earth. Then maybe they'd both be large enough to hold onto an atmosphere. And both planets would be living. Where as our system has one living and one dead world. Is this a common outcome? It doesn't seem it is with Super Earths everywhere out there. Our Earth/Moon System could be a rare occurrence.

Excellent collaboration getting into some fundamental questions.

Love your voice john You could be a radio dj 😂

The crossover I've been waiting for

Woo! I always look forward to new uploads!

Another episode. Another night of good sleep 🛌

One might surmise that a moon of a gas giant might be large enough to not only have a thick atmosphere like Titan, but a molten magnetic core to generate a protective field. It might even be heated internally from gravitational stress. There is no reason to rule out moons as large as Earth or larger with habitable ecosystems.

First time iv percastnated 5 days, became a fan of The moon guys cool worlds from here. Man's brilliant 👏

Cool giants, how cool. Fascinating again John. Thank you.

Poor old Ross give him some water John. Great episode looking forward to part two. :)

can't wait for part 2!

Woohoo it’s here and 45mins too 😀

Great video and information !

I heard they detected a SETI signal from Pluto. And boy is it pissed!

We tend to focus on exoplanets for habitability but given what we know about Jupiter’s moons, exo-moons are just as intriguing.

Amazing as always

We could invent a telescope that would flawlasly detect all the habitable planets and moons around us but it will remain an academic exercise until such time as we develop some sort of a faster than light warp drive. So what's the latest on that being done??

Look forward to listening this tonight. Exomoons, exoconsciousness, hit it Mr. Godier!

Two of my favorite space KZfaqrs, John and David! Question...Will the next generation of space telescopes' configurations, designs and missions be based on the outcome of James Webb? In other words, let's say James Webb discovers some exoplanets that have oxygen-rich atmospheres, but can't determine if life is on those planets. Would the next space telescope's main purpose be to have much greater resolution in order to get clearer images of those same exoplanets?

Good content. Love it

By now the question should be "How advanced can Moon based life become? It's obvious given Life's tenacity and endurance plus the habitable conditions of some of the "nearby" Moon's, that life can exist there.

I really do think gas giants in the habitable zone that have habitable moons could out number habitable planets. Jupiter has 60 plus moons, yes the size of these are perfect but then there are gas giants 6x the size of Jupiter so if we ratio this up we would get exomoons approaching the size of Mars and Earth. :D Also it would be interesting to know how many gas giants are in fact orbiting in the habitable zone, usually that fact gets left out if the world isn't rocky.

This is such an interesting discussion and it shows how much firm definitions really DO mean . . . which is ironic since it sounds like Mr Kipping was trying to posit the opposite. If you tell me FIRMLY that the definition of the word "moon" means that one object orbits the other and that means the center of mass is within the other planet then it changes how I think about moons and where I look for them. More importantly it changes the questions I might ask. The same goes for saying FIRMLY that a double planet has a center of gravity somewhere in the space between them. Where is that center of gravity? Is it stable? Could I stick a satellite or habitat at that point and have it held firmly between the two objects as they move in space? And, of course, the fact that this gravitational relationship can change over time is important too. Once we define the words FIRMLY as meaning these two different things we can plot the change from one state to another. Right now if you ask most people what a moon is they'll point up at the night sky and say Luna, it orbits the earth and causes the tides. But if we are just using the word describe objects similar to the earth's moon why would a Neptune sized object qualify? How about Charon? We call it Pluto's moon and I'm not sure the word isn't MEANINGLESS. We also call it a double planet system and I don't think that means anything either. The words don't describe anything about the objects or their gravitational relationship. You could substitute words like moon, dwarf planet, and planet for "Big dumb rock" and the latter would be MORE descriptive! Big dumb rock . . . OK so it's made of rock, it's not an ice ball or a ball of liquid floating in space, or a bit of stellar plasma, or . . . a million other things. Tentatively I like to think the word "planet" implies a gravitational and orbital relationship around a central star but then we have ROGUE planets that don't fit that definition either. Again planet just means something you intuitively think is similar to the earth in some way and the more you learn about other bodies like Jupiter and Saturn the more I question whether that similarity wasn't a delusion caused by a lack of knowledge hundreds of years ago! As an autistic person I'd much rather have firm definitions that describe the relationship between objects, or structural details about the object. Planet X has 3 moons and it s a giant crystal . . . OK, it's a planet so I know it is orbiting a star and is large enough to have cleared out it's orbit so there isn't a lot of debris there I might riun into while planning a trip through space. It has 3 moons, these are objects in a stable orbit around them that I might want to ask more questions about. It's a crystal, that tells me it has a very orderly repeating structure, lots of questions I can ask about that! See how a very few WELL DEFINED words give me a lot of information about gravitational relationships structural details, and even the surrounding region of space? I can use those details as jumping off points to start asking relevant questions. That's a big deal! I'm not asking questions randomly or making a ton of assumptions I haven't examined yet and all of which are probably wrong because some place like Jupiter or Mercury will turn out to be almost completely different from earth.

Man you are so psychic! I was just wanting to email you to ask you to do an episode on this very topic, but I don't have your email address. I am so excited that you published this episode!

Good stuff!

Perfect timing

Have a goodnight, everyone!

Damn right John Pluto will forever be a planet agreed! 😂🎩 thanks for the interview

Two of the absolute best to ever do it 🪐🪐

Considering there may well be many reasons why intelligent life seems to be potentially favoured on large moons (tides, magnetic fields, protection from impacts, etc.) I would argue that any Rare Earth hypothesis would need to not rely on those factors whatsoever. Furthermore, from a sampling bias perspective (data points: 1) you could suggest that the fact we aren’t on such a moon means they aren’t overwhelmingly more likely than planets for developing intelligent life, be it probability via quality or quantity of the worlds.

Moony McMoonface is the technical term for moon moons

Dream combo!!! Hype to watch this one @Event Horizon!

Woow great!

One thing that didn't get mentioned is that while it is poorly understood Ganymede appears to have its own intrinsic magnetosphere even if it is weak so if that mechanism can be scaled up it seems quite feasible for a larger moon to support an intrinsic magnetosphere. (Which honestly would make for a very interesting setting for life potentially. Also with regards to moons sizes some work looking at the accretion disks of stars indicates that gaps and or rings within them may play a critical role in shaping the size of a planetary body. Given that planetesimal formation perhaps via direct collapse is looking more and more likely to be a much more general process for sequestering angular momentum within the colder molecular regions of an accretion disk allowing the bulk material to accrete onto the central body I don't think it would be all that strange for moons in a system to potentially come in very different sizes though given that the similarly sized orbiting bodies seems to be quite standard for systems within Laplace orbital resonances it does somewhat hinder the applicability to the discussed scenario.

never have i clicked an event horizon video so fast. always love to hear from prof. kipping and anyone else from the cool worlds lab!

Exoplanet moons are important because it can adjust the Drake equation. Rogue planets should also adjust those numbers. I think I first heard about the Drake Equation from Carl Sagans “the cosmos.” The answer to there even being one exoplanet was unknown then. Since then there’s been a lot more added to possible planets, and now I’m hope moons (including our solar system.) Exomoons adds a lot more and I think rogue planets and rogue moons adds more. There’s a lot of rogue planets. Unfortunately abiogenesis from organic compounds become precursors for life is still a mystery in the Drake Equation and other random events after that like intelligent life and technology aren’t fleshed out.

Thx bud epic !!!!

You two should team-up more. Two of my fav YT voices in one vid

I liked this guy and he also had a good microphone

I've heard the term moonlet used in reference to a moon in orbit around larger moon.

cool worlds and moon moons

24:43 “Taxonomy is a human construct” Thanks for clarifying that. I always thought it was invented by arachnids!

Awesome

The first exomoon I learned about was the third moon of Endor.

@David Kipping What do you think of the idea that the Moon causes plate tectonics on Earth?

It would take some fiddling but you could pack a dozen Earthlike moons in orbit around one giant planet in the habitable zone. A whole Star Trek universe in one place.

The barycentric double planet definition could be constrained, like, if the center of gravity would lie outside the larger object calculated as if the two orbited at a distance of 10 radii of the larger body. Earth r = 6371.0 km Earth m = 5.97237×10^24 kg Moon m = 7.342×10^22 kg Barycenter at 10 r Earth = 63710*7.342×10^22/(5.972 E24 + 7.342E22) ~= 773 km so not a double planet Pluto Charon ~= 1289 and R Pluto is about 1188 so Pluto and Charon are a double system it's introducing a very arbitrary human number into things completely arbitrarily, but it feels like an acceptable place to draw a line in the sand if you're gonna.

Wow this will be a great episode to li...sten...

Perhaps earth is a typical sized exomoon kepr in abnormal orbit around our sun?

Pluto is a chunk of ice and rock, not a planet. Also, we need to grab a firmer hold on our moon. Light pressure is the answer.

If there is life in these moons, imagine how would be its sky.

What is that beautiful piece of music in the intro?

Thank you. I wondered about the possibility of a moon's moon. I guess it will be awhile before we find one. Wouldn't it be possible to make thousands of small telescopes and deploy them a little outside Earth's orbit, like Starlink Satellites so they encircle the sun at over 1 AU and have them look at the same objects in sync. I would think that would be the equivalent of a huge telescope at a relatively small cost. Has this been considered?

Cant wait for James Webb to start gathering data!

EH is awesome.😎

Anyone else think David Kipping and Brian Keating look like brothers?

Been a while since Dr. Kipping has been on really love his channel! Two awesome content creators right here :D

More to come! Fantastic! I'm quite invested in David Kipping's quest for exomoons. I really hope one is named after him someday.

Good thing Dr. Kipping wasn’t rude or he would have been axed!

Life might be more rare to a moon. If the moon is to close to a gas giant, it would be bathed to much in it's magnetic field, to volcanic and affected by charged particles. In a goldylock zone orbit away from magnetic field, it would have extreme seasons, limiting food chain. If rotational like Uranus with a Earth like sized moon in the goldylocks zone then maybe.

I guess there's also the hope that one day he'll be able to exclaim "That's no moon!"

Its like you read my mind. I've been wondering if any of jupiters moons are larger than earth and all of the sudden there is a whole new video on it.

If we find life on Pluto, and they're shorter than us, calling it a dwarf planet is astrobigotry

If we ever find an intelligent alien life form that lives in what we call an exomoon, maybe for then the defition of a planet is very different from ours. Maybe, from their point of view, exomoons are planets and the planets that they orbit are their "moons", or something alike. Maybe they think that life can only arise in exomoons. And, if they have astronomers looking for their definition of "exoplanets", as we do, maybe their entire compreheension of how many worlds there are may be misleading, since it is far more hard to find exomoons than exoplanets.

Question. Can a moon be larger in size, not necessarily in weight, than a planet it orbits?

That 2-year long orbit, of that Jupiter analog might seem long: twice as long as Earth's, but Jupiter itself has an orbit/year that's equal to 12 Earth years!

There is a good sci-fi novel called The Dispossessed by the American author Ursula Le Guin that takes place on a moon and its planet

Maybe a bit of topic: but what about Mercury? Mercury you would say: that hot planet? Not possible right? But what about those craters with water-ice in it? Could water become fluid in the tiny surface-zone in wich the hot no-shade-surface and the cold shade-surface-crater somehow meet? Life is resilient and doesn’t need much right? 😉🙂

At least we can understand the narrator unlike Issac A.🖖