00:00Today, over 400 years later, we know these four moons are entire worlds.
00:08Ganymede, the largest moon in the solar system.
00:11Callisto, ancient, cratered and virtually geologically dead.
00:15And Europa, an icy world with a global ocean beneath it, perhaps hospitable to life.
00:20We will know more when the Europa Clipper mission arrives there in 2030.
00:25And then there is I.O. No ocean, no ice and no water.
00:31I.O. is drier than Mercury and at the same time the most volcanically active body in the entire solar
00:38system.
00:39I.O. has around 400 active volcanoes. Not had, has. Permanently.
00:45And that's not a rough estimate. That's the result of decades of observation, starting with Voyager 1 in 1979.
00:56Visualization of the Earth.
00:56What happens when you're talking about a star?
00:57But the stars are going to be the star.
00:57The star is going to be the star.
00:58Now there are the stars over 400, stars over 500, stars over 500, stars over 500, stars over 500, stars
00:58over 500, stars over 500.
00:58And that's a great way to tie the star.
00:58And that's about when you're talking about five worlds.
00:59I.O. is doing one.
00:59So when you're like spending time on marsha with the stars over 500, star and star, star on the map.
00:59You
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