Fun fact: Io, Europa, and Ganymede are in 1:2:4 orbital resonance. Meaning for every time Ganymede orbits, Europa orbits twice, and Io orbits 4 times. But their pattern is such that there's never a triple conjunction (they never all line up on the same side of Jupiter, instead there can only be two of them at conjunction and the other at opposition).
Josh Bobst Perhaps Lunaroids? Seeing as how they're "moon like". But I guess luna is too specific? Asteroons is interesting, but Asteroid means "star-like", so Asteroon is gibberish, AFAIK. Good try, though, man.
Jupiter is considered by some to be a system in it's own right, and as you said in a previous episode it emits heat. When you combine that with the friction from tidal forces on Europa by the other moons, it wouldn't too much of a stretch to say that the Jupiter System has it's own habitable zone.
Jake Long Yes, he´s actually my neighbour here in Vienna. I greet him once in a while, but the only thing he does is stretching his right arm in the air back at me, it´s weird.
liampgc as funny as that is, it's probably a no, it would probably the far-less-cool Europans or Europese Actually, can we start calling Europeans Europese?
Michael Kilduff I am there right now and I can tell you that there isn't much more alien life here than anywhere else on the planet, just some occasional UFO but that is basically it:P
Ganymede is one of my favourite astral bodies. I love the little unique story behind Ganymede as a mythological character too. The aurora light effects on the poles are gorgeous. Europa is extremely interesting with its layers of ice and water and I can't wait for more information on that moon. The movie Europa was really interesting. Thanks for making these videos!
Felicity Jane Smith Macau Macedonia Madagascar Malawi Malaysia Maldives Mali Malta Marshall Islands Mauritania Mauritius Mexico Micronesia Moldova Monaco Mongolia Montenegro Morocco Mozambique
sheepwshotguns Scrap the human spaceflight program and you can have a comprehensive Europa mission within a couple years. Somehow humanity is fixed at sending warm mushy living tissues into hard vacuum.
sheepwshotguns Well under 90km of water, I'm not sure we could capture any visible light. And I think bacterial life doesn't emit much infrared light. So you would basically have a black screen...
I hope you can go into the fact that 3 of the moons are in an orbital resonance. That concept is actually very important in astronomy and can create some wacky scenarios.
Phil, Crash Course Astronomy is amazing. Your depths of knowledge and your didactic skills make this show so much fun to watch. Please keep it up, love it!
CrashCourse guy. In one of your next classes, please explain the physical-chemical origins of gravity, so important to all of us in the Universe. Love your classes. Thank you.
This episode, particularly the section about Europa is the reason I tune in to this show. I've been so curious about Planets (or in this case Moons) we believe have the conditions for living organisms. I don't remember ever being this interested in learning when I was in school. Loving this series so far, thanks for keeping it interesting!!!
Thank you very much for making this video. Phil Plait and the others at _CrashCourse_ Astronomy! It was really interesting to learn about the moons of Jupiter. Jupiter - the gorilla in the Solar system, the giant that is really hostile to live but has moons that are promising in the search for life on other worlds. Go Europa! I can’t wait for next episode, where we will learn about Titan and Enceladus! By the way, I live in Europe and this also seams life can exist here to. ☺
The video definitely shows the improvements that had been made by man in terms of astronomy. The aesthetics of the video were really fantastic since not only it is fun, but it also greatly helps in the understanding of the topic. They weren't all over the place and it gives the vibe of a conducive learning environment. Also, the interrelationships of the four moons and Jupiter were highly emphasized; it makes learning easier for the viewers. An example of it is: the sulfur-rich material being ejected because of the activity with the other moons which is tidal flexing which heats its interior through friction. It's also great that the video also put emphasis in Europa's comparability to Earth. The existence of carbon-based molecules and salt supports it. The possibility of the spawning of life in Europa is probably a staggering discovery for mankind since it helps in the innovation of astronomical research
The names of the Galilean moons (Io, Europa, Ganymede and Callisto) were given by Simon Marius. There is some contention as to who "discovered" the moons initially, with the satellites ultimately being named after Galileo, yet the names for them came from Marius. Love these videos!
the way he describes the sky of the moon closest to jupiter... things like that are the reason I seek out for videos like this.... incredible.... keeps the curiosity juice flowing... its things like this from which science fiction is born... such a huge mass on the sky wow.... they should send a probe just to observe from the sky from that moon :P ....
It's rediculous how much I love this series. I was going to observe Saturn today but the damn clouds came before I could get home and get my telescope out.
Here's my metric for "Is it a moon or not:" If I (an average human) can stand on the body, jump as hard as i can, but still be brought back down to the surface by gravity, it's a moon. If I can escape the body on leg power alone, it's a satellite.
+rlrsk8r1 by your definition, earth is a moon, revolving around the sun (which is also a moon revolving around the center of the Milky way). Your definition needs more specifications.
I wonder if a moon can have a natural satelite on it's own. Now I know it may sound crazy, but I see no reason why it would be impossible. (Arent there are like stable orbit zones around all celestial objects? Langrange points, maybe? I dont know)
Dávid Abonyi I think the problem would be that the moons are already so close to a large planet, that the "moon's moon" would likely get thrown off balance by the planet and fall down to it. I suppose it's technically possible though, if everything lines up just right.
Dávid Abonyi *cough* we're about to have a revolu-ception here *clears throat* an small asteroid rotating around a large asteroid rotating around a moon rotating around a planet rotating around a sun
Maybe you are speaking of "tidal locking"? like our own moon is tidally locked to the Earth. One side of our moon faces the Earth all the time, the other side doesn't, gravity pulls on the side facing us more than the side that doesn't.
If we were to count tennis ball sized rocks Moons, then I bet the Earth has more than one moon. And many of them would be very fascinating since they are made with a very strange mix of materials that looks way to complicated to be natural. oh and they communicates with your smartphone.
I wonder what Galaleo's reaction would be in his time if we talked to him about this. He'd either be crazy excited or think we were getting way ahead of ourselves.
Fantastic summary! I'd never want to live forever, but I'd love to be able to somehow "return" and check out the Universe and humans at points in the future. If I could return in a hundred or more years when we hopefully send craft to Europa, I'd love to be able to "return" just to find out what humanity learns from exploring the oceans of Europa. It could be nothing but a frigid lifeless ocean, but it could hold life....
On the Expanse, a character says he's gonna hide the ship "behind one of Jupiter's 71 cute little moons" while the rest of the crew went down to Ganymede. Keeping in mind it takes place two centuries (at least) into the future. I do know that at least one new one has been discovered since this video was created.
thanks for the knowledge im a student of English literature but i had a strong attraction to study astronomy but fate brought me here im hoping one day my child will study astronomy
There's a huge number of maybes for life on Europa. The one that strikes me as most important is how stable the ecosystem is over billions of years. Stuff is crashing into Jupiter, hitting moons on the way in. Radiation could be a source of life energy, but also could sterilize anything not tolerant of it. It would be very cool to be piloting a camera underwater there and suddenly stumble upon a weird skeleton or something, though.
why should we call our moon THE Moon? at least for long? We should find some way to distinguish in from the rest, someday, if Humans colonize other planets. We need to distinguish between each moon. Even humans on other planets someday would call their moons THE MOONS or the moon. We could nickname our moon "Luna" to distinguish it
99batran . I think that the moon (our moon) is technically called Luna. At least in every video game I have played that involves space travel and exploration, the name of the celestial body that orbits Earth is Luna (although, video games are not an offical source for information).
West Kagle The sun, moon, and our planet have no set name. Sure, we've all seen the names of Sol, Luna, and Terra, but they are just popular names. Every language calls them something different.
99batran We do distinguish it. Our moon is named Moon. Admittedly that's a little like naming your dog Dog, but it works well enough. I second "Luna" though, which, like nicknaming Dog Canis, isn't' really any different, but it does sound a bit better.
99batran Our moon is actually called Luna (which is Latin for moon but still...) just like our sun isn't called The Sun its called Sol. This is where you get Lunar and Solar from.
Crash Course, do you still take questions? I've read that Jupiter radiated a lot more heat early in its life, but I've never been able to ascertain how much. Do you know warm Jupiter was after its birth, and was it warm enough to liquidate its moons?
I'm really thankful that he said, "We think Earth's life originated in salty ocean water." They didn't sate this theory as fact as most science-oriented documentaries do, even when they can neither confirm nor offer any tangible substantiation. Saying "I think" or "We believe" shows some integrity that most educational programs or documentaries don't show when they're talking about the origins of life on Earth.
Like a black hole devouring stars im devouring all this awesome info much love and respect and appreciation for the education of this vast vast universe
BLASTER KEYGGARZ because soviets blew all others when they landed there and Stalin even got them deleted from historical photographs and other refferences. But this was luckier as Americans landed here so it is still there but cannot tell till when.
Does Ganymede's electromagnetic field shield the planet well enough from radiation from Jupiter that colonies could be established there? Could it be warmed up by diverting one or two of the smaller moons into a collision with it? Looking forward to future missions to Jupiter's moons.
