Jupiter’s Moons: Crash Course Astronomy #17

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Before moving on from Jupiter to Saturn, we’re going to linger for a moment on Jupiter’s moons. There are 67 known moons, and 4 huge ones that we want to explore in greater detail. Ganymede is the largest – larger, in fact, than any other moon in the solar system and the planet Mercury! Callisto, orbiting the farthest out, is smaller but quite similar to Ganymede in many ways. Io, meanwhile, is most noteworthy for its tremendous volcanic activity. There’s also water on Ganymede and Europa!

This episode was brought to you by Squarespace http://www.squarespace.com/crashcourse

Table of Contents
Jupiter Has 67 Moons (4 Big Ones) 0:12
Ganymede is the Largest 1:15
Io is Riddled With Volcanoes 3:16
Europa Has an Undersurface Ocean 4:48
Io, Europa, and Ganymede Interact Gravitationally 3:48
Known Unknowns 8:06

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Galileo’s notebook http://hos.ou.edu/exhibits/exhibit.php?exbid=4 [credit: Image(s) courtesy History of Science Collections, University of Oklahoma Libraries; copyright the Board of Regents of the University of Oklahoma.]
Jupiter’s moons http://photojournal.jpl.nasa.gov/jpeg/PIA00600.jpg [credit: NASA/JPL/DLR]
Ganymede http://svs.gsfc.nasa.gov/vis/a010000/a011100/a011173/Image4_1920x1080.jpg [credit: NASA/JPL/Ted Stryk]
Interior of Ganymede https://commons.wikimedia.org/wiki/File:PIA00519_Interior_of_Ganymede.jpg [credit: Wikimedia Commons / NASA]
Ganymede terrain https://commons.wikimedia.org/wiki/File:Ganymede_terrain.jpg [credit: Wikimedia Commons / NASA]
Artist Conception of Ganymede http://www.nasa.gov/content/goddard/hubbles-view-of-ganymede-briefing-materials/ (Figure 5) [credit: NASA/ESA]
Callisto http://photojournal.jpl.nasa.gov/jpeg/PIA03456.jpg [credit: NASA/JPL/DLR]
Interior of Callisto https://en.wikipedia.org/wiki/Callisto_(moon)#/media/File:PIA01478_Interior_of_Callisto.jpg [credit: Wikimedia Commons / NASA]
Valhalla crater on Callisto https://commons.wikimedia.org/wiki/File:Valhalla_crater_on_Callisto.jpg [credit: Wikimedia Commons / NASA / JPL]
Io http://svs.gsfc.nasa.gov/vis/a010000/a011400/a011455/s1-1920.jpg [credit: NASA/JPL/USGS]
Io volcano image http://solarviews.com/browse/jup/ioplumedisc.jpg [credit: NASA/JPL]
Io eruption video http://svs.gsfc.nasa.gov/vis/a010000/a011400/a011455/IO_Eruption-540-MASTER_high.mp4 [credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute]
Io surface http://svs.gsfc.nasa.gov/vis/a010000/a011400/a011455/s2-1204.jpg [credit: NASA/JPL/University of Arizona]
Jupiter Magnetosphere Schema https://en.wikipedia.org/wiki/Io_(moon)#/media/File:Jupiter_magnetosphere_schematic.jpg [credit: Wikimedia Commons / Volcanopele]
Jupiter aurora http://www.spacetelescope.org/static/archives/images/large/heic0009a.jpg [credit: NASA, ESA & John T. Clarke (Univ. of Michigan)]
Europa http://photojournal.jpl.nasa.gov/jpeg/PIA19048.jpg [credit: NASA/JPL-Caltech/SETI Institute]
Europa ocean http://apod.nasa.gov/apod/image/1205/EuropasOcean_KPHand003.jpg [credit: NASA/JPL/Kevin Hand
Habitable zone diagram http://www.keckobservatory.org/images/made/images/gallery/solar_system/Slides-8_1800_1350.jpg [credit: PETIGURA/UC BERKELEY, HOWARD/UH-MANOA, MARCY/UC BERKELEY]
Amalthea http://photojournal.jpl.nasa.gov/jpeg/PIA02532.jpg [c redit: NASA/JPL/Cornell University]


ll Red ll says:

can a moon have a moon?

ll Red ll says:

I had no idea Jupiter had that many moons. jesus

Dylan Blockert says:

Europa is too cold to support life

AzuliManni says:

7:07 Trappist-1!! Everybody keep your fingers crossed.

freeraid6 aka v sexinhell says:



Riona Sera says:

Jupiter must have a crazy werewolf problem.

paddy leigh says:

Cool I've got a Jupiter book that has all the moons

Jerrell ISIDERIO says:

youtube was meant to be blocked on school wifi lol

Govinda Dasu says:

Europa seems promising

kupislouft says:

Going to Europa to Cannonball. Anyone with me?

KnightCraft 130 says:

gotta love that intro DADADA DADADADADA-DADADA

Connorland11 Does some stuff says:

That's no moon- obi wan

jazar stevens says:

finding any life on Europa would be "bad news" according to Bostrom
that would indicate that the great filter (fermi paradox) is ahead of us instead of behind us

poisinivyisepicandwasomexD i love dragon ball z says:

Like if see difference 😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😯😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧😧

Teethgrinder 83 says:

Ok I'm going to have to embarrass myself here and ask-what on earth does 'DFTBA!' mean? lol I've seen other acronyms in other crash course series too and I'm just as clueless about them-any help is greatly welcomed! Haha

Kris and Todd Goens says:

That's no moon…

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