The Most Boring Moon in the Solar System? | Our Solar System's Moons: Rhea

[@astrumspace]

Get NordVPN 2Y plan + 4 months extra ➼ nordvpn.com/astrum It’s risk-free with Nord’s 30-day money-back guarantee!

[@lupiusz]

Naaah

[@BackwoodsTinkerer]

Nah... I'd rather have the book I paid for several months ago

[@dphuntsman]

I purchased NordVPN; it works on my iPhone- but WILL NOT WORK here on my iPad.

[@YouCanHasAccount]

Imagine thinking MITM attacks are still possible in 2024. No, you do not need a VPN to use public wifi safely.

[@MrWeedWacky]

couldn't the strange shape and the electron density be explained by the E-ring. Since the orbit of Rhea keeps the same side of the planet in front of it's orbit, the E-ring would be deposited unevenly on one side of the planet, distorting the shape over time.

[@Tsurf]

When pictures / videos from space have to be prefaced with "the following images you are about to see are real" you just know that you're about to see some awe inspiring stuff.

[@zam6877]

And "real" is always more interesting

[@dphuntsman]

But it’s appreciated to know, in this day when, when in doubt, just assume AI…..

[@spldrong]

I spent last night with friends, listening to music on some utube channels that just showed beautiful views while the music played .... Got real dicy when the AI views started coming and at times half the room thought it was real

[@mikemondano3624]

It means they may be AI or an artitstic rendering.

[@rah5931]

Look at 4:56 and TRY to convince me these are “real” photos … I suppose starlight can be seen through Rhea? Yeah, sure.

[@sizanogreen9900]

I love that this series is still alive:)

[@astrumspace]

I have some more moons I want to cover soon as well!

[@felixmorar8203]

​@@astrumspaceshed light on them. They are all yours

[@Keansstuff]

@@astrumspaceplease do

[@socrabe]

​@@astrumspace it's my favorite serie! Thank you!

[@LittleBallOfPurr]

That was a rheally awesome video

[@TheWatcherxx99]

👏🏻👏🏻

[@astrumspace]

Oh wow 😂

[@kiraalexandraruizburgos1236]

I'm so happy that you are continuing the moons of the solar system series.

[@DrMackSplackem]

Some of these sequential images are fantastic. I'd seen a few of them before but I hadn't realized the sheer number taken by Cassini.

[@astrumspace]

Someone did a time lapse on KZbin of every photo taken by Cassini, and it's hours and hours long. A lot of it is very jumpy, but there are some awesome sequences like some of these of Rhea

[@rhoanjenson7475]

Agree !!

[@real-raiden-ei]

So basically Rhea is a icy moon with CO2 gas in it. Means if it has liquid warer underneath we can just add some coco cola flavoring and we will be having a soda moon

[@Cerbera66]

🤣😁

[@ThecrackpotdadPlus]

That was exactly what I was thinking :) hehe

[@Willyflan]

Mac and me?

[@limo1795]

plot twist: coca-cola comes from rhea

[@AndrewBurris-pj3wl]

Too bad coca cola can't solve water+CO2+flavor. Diet coke is nasty and I am suspicious of anyone who likes it.

[@RodneyWilson-o4k]

Sorry I see a few people are talking about the title. Remember there are people that are watching this that are just getting into space just starting to research or get to know some of the different objects in Outer space young children, etc. and often when you are researching and were looking at something only the most prevalent show up like Titan, so it’s good to hear more about the other moons after all there’s more than 100 of them around Saturn so plenty of opportunity to explore. What’s there the fact that this is such a large one and has very little channels opportunity to get to know a little something about it.and for other programs that moons over and over again and most of us know most of the details about them there’s going to be no title you can have that wouldn’t make someone go. I already know that. Because everybody knows something about that moon. But this one is a little more obscure, so thank you for taking the time to bring some of its details to light. And help the old and the young get to know some of the I objects out there even if some of them don’t get covered as much.

[@elagabalusrex390]

Well the people who don't like the wording of the title are entitled to their opinion too. It's called freedom of speech - and an alarming number of individuals seem to be forgetting that in the public forum these days, I've noticed. Most of them are on Bluesky right now.

[@zimriel]

thing is, Rhea isn't nearly as cool as Enceladus and Iapetus. Even Mimas and Hyperion have aesthetics. Rhea will be good for draining ices I guess.

[@dphuntsman]

@@elagabalusrex390There are things worth being obnoxious over maybe; titles- when such a wide variety of folks, including kids, are watching and using these- are not one of those. Prove you’re the knowledgeable, experienced adult you imply, and chill, ok? - Dave Huntsman

[@cetchathach4206]

​@elagabalusrex390 ah yes. The enlightened "everyone's opinion is equally valid". Except no. Everyone have their opinion, sure, but sometimes they're just *wrong*. And it's okay to say when they're wrong.

[@elagabalusrex390]

@@dphuntsman Okay, well I disagree with you lol. I don't have to prove anything - it's youtube, not a court of law.

[@mckiem0use]

Your videos about moons are my favorite! They’re probably the most interesting objects in the solar system due to how diverse and unique they are. A shame not many talk about them.

[@dphuntsman]

I agree. Especially as a space development advocate, the moons are where it’s at, essentially. - Dave Huntsman

[@deniskapral5505]

True. I remember a BBC documentary I saw years ago about the moons, and there was one sentence I still remember: We haven't even left our solar system yet, and already we have to re-evaluate all our theories about these bodies.

[@jokerace8227]

Perhaps Rhea has occasionally displayed similar geologic activity as Enceladus does currently, but given the larger orbit, weaker tidal forces, it has much longer phases of dormancy, maybe millions of years in between short outbursts of any sort.

[@dbaider9467]

Great presentation. A moon covered in water ice could be useful in the distant future.

[@kingalex105x7]

honestly love these moon videos and hope you do more even on some minor moons in like a complication video

[@Stephan1988]

Rhea in Greek mythology is the daughter of Ouranus and Gaia. She is a Titan and the sister of Saturn (or Kronos in Greek).. She is also the mother of the Olympian Gods Demetra, Hades, Hera, Hestia, Poseidon, and Zeus.

[@uncletoad1779]

And she wrote "Driving Home for Christmas".

[@Leftatalbuquerque]

@@uncletoad1779 And she is a large flightless bird.

[@jordanjohn3360]

This channel is awesome

[@sirensynapse5603]

Hi Rhea, nice to meet you.

[@LFacts-news]

Rhea may play second fiddle to Titan, but its icy cliffs, strange atmosphere, and cratered surface are full of secrets waiting to be uncovered. What’s your theory-does Rhea have more surprises in store?

[@peterwright217]

top show Alex, hope to see more in the new year.

[@grimof7035]

music in the intro + still frame slideshow makes me feel like im watching a destiny cutscene, awesome stuff as always

[@mal2ksc]

Rhea and worlds like it are going to be interesting in one of two ways: •If not inhabited, that's a lot of water for the taking and we humans need water more than anything but air. •If inhabited, how can that _not_ be interesting? Even if it's no more complicated than sulfur-eating bacteria, it's a chance to study another example of evolution.

[@JayToGo]

What‘s the music before 1:13? It‘s awesome. Quite fitting for the wonders of celestral bodies.

[@SuperFish40]

Love these types of Astrum vids. Keep the moon series coming please!

[@slushbilly5893]

That's no moon. It's a space station!

[@TheWatcherxx99]

A fully armed and operational battlestation!

[@3dfxvoodoocards6]

I was able to see Rhea even with my small 70/700 mm telescope. But it looks just like a star, no details visible.

[@CCXRTrevita]

too far buddy

[@xBINARYGODx]

@@CCXRTrevita not with THAT attitude

[@the_south_atlantic_anomaly]

So could you melt the ice and drink the water? Use electrolysis to separate oxygen to breath and hydrogen to burn for rocket fuel and to heat your shelter?

[@Релёкс84]

That's the least of you problems.

[@ivoivanov7407]

You may need to filter it, but yes, purified water will be good for drinking and electrolysis.

[@mal2ksc]

Assuming the place isn't already inhabited, this probably will end up happening.

[@quistan2]

Little known theory. Rhea is captured ejectica from Uranus when a kuiper belt object known as Dia slammed into it.

[@michaelfritts6249]

Oops!!! 🙄😏🤣🤣

[@pe1900]

that wouldn’t make much sense to me, since it’s so similar to other saturnian moons in orbit size composition and other stuff, plus it just being simpler to imagine it not happening and rhea forming around saturn like you’d first expect. would like to know if there is good reason to think this though

[@quistan2]

@@pe1900 The Dia-Rhea from Uranus hypothesis, is just a hypothesis, but those that support it just have gut feeling about it.

[@katiegabriel1412]

I love your videos. I didn't know anything except Rhea's name. Thank you. 😊

[@PrincessDianaJ]

Ohhhh perfect timing❤

[@AceSpadeThePikachu]

As a solar system trivia enthusiast since kindergarten, I'm embarrassed to admit I completely forgot about Rhea. Though I do really hope you do a video on another underrated moon of Saturn soon; Mimus, the Death Star moon.

[@davidbailey453]

Loving the video. There are many many moons that I know so little about

[@rheababji5657]

As a Rhea, I'm glad to have learnt so much about my celestial namesake!

[@jeffreygarcia2783]

So if we crash rhea into mars and wait a few million years we got a second earth

[@pe1900]

far far too much water, mars would be like 10 kilometers underwater

[@jeffreygarcia2783]

@pe1900 that's fine ocean planet sounds cool anyway

[@jeffreygarcia2783]

Could use Olympus mons as base

[@dphuntsman]

Astrum, I for one love your overall approach to these subjects, and wouldn’t change it. I have a possible suggestion: to consider, in future, adding on a short, 60-seconds or so, short take, on what place the subject of the particular video (today, it was the moon Rhea), might have in humanity’s expansion into the solar system; i.e, space development. If you were to consider adding such a short add-on, there are (relative) experts you could consult with in doing your research for it: people like Dr Phil Metzger at the University of Central Florida; Dr Chris McKay at NASA Ames Research Center; Dennis Wingo of SpaceBilt, Inc. are three excellent folks to start with. Using Rhea as an example, the three of them have worked enough lunar, Mars, asteroid, even Titan et al development mission thought profiles that if you asked them to contemplate their navels for thirty minutes to give a first-take on what place a moon like Rhea could have/provide in a space development context, they could give an initial response that would be half-ways intelligent at the least. Just a thought. It would tie up the end of the ‘story’ that these planetary bodies aren’t just objects of curiosity and study- but might have the potential to be part of the human future. Ad Astra! - Dave Huntsman

[@LeBionArc]

My 1 year old daughter is named Rhea, after this moon. "A small amount of gas around Rhea is expected" - It sure is, buddy.

[@microbuilder]

I really hope in my lifetime I get to see a probe go to Europa or Enceladus, and go under the ice...gotta be one of the most intriguing things ever, I want to know whats in that water!

[@joebombero1]

The tremendous amount of radiation probes are exposed to on these moons complicates the mission greatly. It is likely even a very fortified probe would last only a few months. Another complication is how a probe melting through a hundred kilometers of solid ice would communicate to a probe on the surface. We could get into the oceans with existing technology but not be able to transmit any information back.

[@abrahamdraper1911]

I've often wondered why Rhea is so obscure compared with her more celebrated sisters... Anyway, great series, thanks for your commitment. Long may it continue!

[@JCRABWORLD]

Almost all of Saturn's moons are forgotten to me. Can I get an amen fellas😊

[@simonmcnicholas]

Love these ones 👍🏻 please do more moons 😊

[@johndoecro984]

I am still fascinated with the fact that someone managed to discover something so far away in 1672...

[@auntvesuvi3872]

Thank you, Alex! 🪐🌑🌕

[@bigsarge2085]

Interesting!

[@zolimajster8313]

Warsaw proudly represent :D

[@Me97202]

I learned a lot from this video. Thank you.

[@palantirlotr5623]

Great video as always, thank you!

[@zoompt-lm5xw]

Love docus about forgotten moons and minor planets

[@PianoBruce]

That was really interesting! I’ll be honest I genuinely thought this could’ve been click bait but I should trust that you make good content Astrum, good one 👍

[@bilmania11]

Finally a good video!

[@GeeEmming]

Awesome video, really one of the lesser talked about moons. Understandable when you consider its neighbor i suppose lol.

[@AndrewSkow1]

8:13 A Triaxial Spheroid is a sphere distorted on three axes. What you describe, what you show, is an Oblate Spheroid.

[@chinafriends]

The forgotten stepchild moon of Saturn

[@projectarduino2295]

I just read the entirety of of “2001: a Space Odyssey”, so I find it ironic that you put up a Saturn video up on the same day.

[@pe1900]

i would love to see two more similar videos on tethys and dione

[@treyweaver5396]

Good vid!

[@JClouseauB_-_Jiří_Blažek]

Would be really fascinating find out that the surface ice is just a crust collected over the eons originating from other moons ejections.

[@Kaaba1122]

I always like to learn interesting things about worlds that i once thought were quite boring.

[@TheJadeFist]

The lack of rings or debris disk, or charged debris previously detected could have been the temporary result of like an eruption or an impact.

[@MGCMorph]

Im no scientist or heavily into geometrics but I thought earth was an oblate spheroid for the same reasons you called Rhea a Triaxinal whatever?

[@stepaushi]

1:45 That diameter does not make it roughly 1/2 the size of our moon. It makes it roughly 1/8 the size.

[@callumbush1]

Gone a Rhea.

[@hikerJohn]

It's also possible some craters have dark bottoms because it came from what impacted and caused the crater.

[@BrianWould]

I can't wait until the Europa clipper arrives 🦭

[@mattbrew11]

What is that

[@AllKindsOfCoolThings]

It's going to arrive to the Jupiter system, not to Saturn

[@brick6347]

​@@AllKindsOfCoolThings🤫 don't spoil it!

[@thenightscythe2030]

Rhea has mostly been ignored because of how far out in the E Ring it is.... it is also super likely that Saturn's Rings spread even farther past Rhea in its early years, since it is already proven the Rings have been sinking into Saturn since they stabilized... would certainly explain the Large Size and excessive Cratering

[@andrewsarchus6036]

It seems unlikely that infalling ejecta from a previous large bolide impact would simply fill in older craters leaving no trace. Those younger surfaces look more like flows of some kind.

[@luckan20]

Excellent video

[@GeneFraxby]

Alex and team, please consider a deep dive video into my favourite solar system body - the criminally ignored Ceres

[@cohutta_pines]

HER NAME IS RHEA AND SHE DANCES CROSS THE SAND!🎶🎵🎵🎶

[@AchuCrankey2898]

Watching from Northeast iam interesting to learn more about universe itself

[@n31x]

North East what?

[@tu1469]

Today I learned that our moon has a hot core ! Crazy

[@Tal-q3r]

weirdo 🧐

[@bunnyfan9960]

@@Tal-q3r They aren't wrong! The moos core temperature is like 1,300 degrees from what I've heard

[@Tal-q3r]

@bunnyfan9960 et 🐮?

[@Ancientalienshistory]

Communication with space probes is crucial for missions, but similar technology relies on secure internet connections, highlighting the importance of cybersecurity in modern explorations.

[@paullightowlers7950]

Iove the show thankyou

[@tricks7844]

Hey Alex big fan of your work I have a question why is everything round in the universe cany you make a detailed video on that

[@jgoodman85]

A robot lander looking for magnetic materials and analyzing what it finds would be very interesting. But send receive times would be nuts

[@sid2112]

I want the narrator to sing Goodbye Moonmen for us.

[@treefarm3288]

Thanks for the informative video. Now I know a lot about Rhea (not the bird).

[@simoneverodimarrow]

Magnificent ✨✨✨

[@Paul_Rohde]

4:15 seems like a red cyan stereoscopic 3D image, but you have it around -45 degrees, which makes it difficult to view, when I grabbed the 3D glasses.

[@donodecarrovelho-sjc]

Whenever you hear "I'm Alex McColgan, and you are watching Astrum" you can be sure there's a really interesting video about to begin.

[@replica1052]

(chances are moons and asteroids origin from previous planets spinning them selves to pieces - previous planets where we now find the asteroid belt and the kuiper belt )

[@AmeliaDíaz-l4k]

Mr. McColgan, how about a very interesting video on Saturn's fifth moon Tethys, which, just like its matrix planet Saturn, is less dense than water?

[@tommy-er6hh]

• Saturn co-orbital 1 horseshoe (2013 VZ70), 1 temp trojan (2019 UO14) at L4, Has weaker than earth magnetic field but extend 500x further due to Saturn’s mass [although theory says it should not exist] with radiation belts (which vary by amount of extreme ultraviolet radiation (EUV) from the Sun and absorbed the 5 moons from Janus and Epimetheus to Tethys). The magnetic field has a flux transfer event/portal sometimes on day side where solar wind flows through. Also Saturn may enter the tail of Jupiter’s magnetic field once per orbit. Saturn has higher upper wind speeds than Jupiter. Saturn gives off more infrared light than light absorbed/reflected, and approximately 10 ½ hr rotation which gives it oblate shape. Saturn radiates 2.3x as much energy as it receives from Sun. [Saturn is in a 2:5 resonance with Jupiter.] • Many Rings mostly ice and gas about 100,000 million years old and inner rings will disappear in about 100,000 years (because of the Sun radiation, meteoroids, Saturn’s magnetism & gravity causes “ring rain” from 25 to 55 N/S latitude - which both deionized and heats Saturn’s Ionosphere in a band), they are divided & guided/shepherded by inner moons, shepherd moons Pan and Atlas have an ice tutu around them. The rings have their own exosphere of sublimated ices.. Destruction of ex-moon Chrysalis may have caused most of rings, but there are other theories. Moon Enceladus is believed to be the cause of E ring, the vast faint F ring/ghost ring that goes out to moon Titan is believed formed by old collision with moon Phoebe. Moon Titan far out does not affect the inner rings much. In addition the rings have dark seasonal “spokes” across the rings in fall and spring that may have a magnetic cause. • Janus and Epimetheus are ring shepherd moons that co-orbit each other in a horseshoe orbit around Saturn. • Mimas no cryo volcanism/geysers, but a possible underground ocean. orbital resonance 2:4 with Tethys - and it also has a 2:1 resonance with Cassini Division of the Rings. • Enceladus cryo volcanism/geysers from south pole forms a large torus that co-orbits, exosphere unknown although in the middle of “E” ring, which it creates by the cryo volcanism/geysers. These come from a warm sub surface source though cracks in the ice. Most reflective ice covered moon. Orbital resonance 2:1 with Dione causes tidal heating, tides vary from 1 to 10 meters. Arcs to Saturn’s poles cause aurora spots and “rain” around 62 south causes ionosphere heating. • Tethys with two trojan moons, 1L4 Telesto (leading) & 1L5 Calypso (trailing), orbital resonance 4:2 with Mimas, inside the “E” ring • Dione with two trojan moons, 1L4 Helene (leading) & 1L5 Polydeuces (trailing), Dione also seem active with fresh ice cliffs. orbital resonance 1:2 with Enceladus, inside the “E” ring. • Rhea 2nd largest moon after Titan, tidally locked to Saturn, ice surface inactive, with many craters, Exosphere of CO2 and O2, no magnetism, near outside of the “E” ring • Titan (96% of all Saturn moon mass, bigger than Mercury) 3-10x higher atmosphere than Earth with a cold (−290 °F, −179 °C) nitrogen/methane atmosphere with clouds/rain & 160% Earth’s pressure, has liquid ethane and methane lakes/seas, it has tides of 30 feet (10 meters) on the ice which indicates a probable under surface ocean. orbital resonance 4:3 with moon Hyperion, limit of “E” ring. • Hyperion is an irregular potato shape ice moon, no poles nor equator because it has a chaotic rotation due to 3:4 orbital resonance with Titan, which also makes Hyperion’s orbit irregular. It seems to be the remnant of a collision. It has a very low density, probably with many voids inside. • Iapetus has a ridge around equator (like shepherd moons Pan and Atlas) that maybe evidence that it had possibly a ring for a while. • Phoebe is thought to be a captured Centaur object. • 145 Moons of Saturn in total, although this may change.

[@Synthematix]

Rhea belongs to Chris

[@EnerJohn94]

He'll pick it up as he's driving home for Christmas.

[@peterectasy2957]

i dont know how he is doing this, but his voice is smiling -)

[@ardsam6922]

Mimas next!

[@lindabarrett5631]

Fascinating.

[@fujimotokazuma2114]

Has there been an explosion in space? If there ever was, how did space interact with the flames?

[@callyman]

I believe NASA did the people of this world an amazing service by exploring these worlds. Words cannot convey the sheer amount of gratitude i feel their owed because of this.

[@itsremaine]

wild i was just reading about rhea and Io earlier today

[@paulmuriithi9195]

best finishing video to an awful 2024. thanks astrum

[@Venexes8]

Sorry to post it here, but just wondering if there is an update for the Incredible Universe book that people ordered. I haven't seen an update on this channel or know where to look. The last email I received was October 28th. I have been following along but really have not heard anything more about it. Thanks.

[@neiltropolis]

What if we could move Rhea to earths orbit. Would it just be a mass of a floating ocean with some rocks? Or would it all just dissipate? Thank you for the great upload.

[@kerianhalcyon2769]

Still bugs me that they decided to scrap Cassini and send it into Saturn instead of, I dunno, letting it stay in orbit and see if the engineering still works and give us a more permanent probe that can give us more data on one of our strangest planets. That aside we need to fund more missions. I'd love to see us start sending probes with landers over to some of the moons so we can get more physical data on our neighboring worlds.

[@robadams1645]

You probably know this already, but they crashed it so it wouldn't run out of propellant and eventually crash on one of the moons, contaminating it with earth life.

[@kerianhalcyon2769]

@@robadams1645 Unfortunately that doesn't stop them from contaminating Saturn itself with Earth life. I'd actually argue contamination and spread is more likely to happen in Saturn than on a frozen moon.

[@wildyracing1]

With all due respect, I am a long time subscriber to your channel. Lately your video titles have become very assuming and I do not like that. Please do not ride the clickbait train with provocative titles, cause in your channel it is insulting to your educated audience. I am certain most people here know something about Rhea... This and that "the last pictures you will ever see of Pluto" is very assuming, you can not know that for certain, thus it is not appropriate to have any of those wordings in a serious science popular channel. Hope this is taken as a constructive critique, not as a bashing. Good luck, Astrum!

[@dsmccolgan]

There won't be a mission to Pluto again in your lifetime, I will bet you £5

[@michaek7438]

shut it mate

[@jamesstenner8335]

Fair comment I reckon first thing I said was I know rhea

[@Interactingwithlunatics]

How about you do you on your channel, and quit crying online incessantly, mkay?

[@astrumspace]

Maybe I just take it from my perspective too much, but I really didn't know much about Rhea before researching this video, and I genuinely think it is forgotten by scientists in favour of other, more "exciting" moons. No offense meant, but I think for 99% of people it's true.

[@Setanta1913]

My first Jack Russell was called Rhea. She was a real titan.

[@oficialcarloscarbajal6947]

Rhea an its sibling moon Dia could be a dangerous threat to Uranus someday

[@fumanpoo4725]

You deserve the Nobel Prize. Well done!

[@InfiltrateIndustries]

Wouldn’t probing an icy moon’s ocean be near impossible? A lander with a melting device (or drilling) would have to withstand enormous pressure once it reaches liquid water

[@Axgoodofdunemaul]

Given all that water ice, and a super-high-tech energy source Rhea might be made into a weird low-gravity ocean world populated by Earth sea life, and, of course, the floating sea-palaces of the rich.

[@thezood]

The Raised by wolvesish cuts at the beginning made me slightly uncomfortable

[@jeffreygarcia2783]

Can anyone tell me if any moons in our system are not tidally locked?

[@astrumspace]

Yes, lots of "irregular" moons of the gas and ice giants

[@jeffreygarcia2783]

​@@astrumspace thanks

[@JohnnyAngel8]

From Wikipedia: "All twenty known moons in the Solar System that are large enough to be round are tidally locked with their primaries because they orbit very closely and tidal force increases rapidly (as a cubic function) with decreasing distance.[16] On the other hand, most of the irregular outer satellites of the giant planets (e.g. Phoebe), which orbit much farther away than the large well-known moons, are not tidally locked." Pluto and its moon, Charon, are tidally locked but Pluto's other moons are not.

[@finscreenname]

Now all those sci-fi movies about aliens coming to Earth to steal its water really don't make a lot of sense ....

[@Shockwave27]

Hey bro. Amazing video. Mind accepting my suggestion and making a video about Saturn's 3rd largest moon Iaepetus. Would be a blessing.

[@teamlean3717]

700 likes, now lets go to 70k & beyond ,,,

[@astrumspace]

I wish!