Io The moon that looks like a pizza Relative Sizes.

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Presentation transcript:

Io

The moon that looks like a pizza

Relative Sizes

Io Movie

Io's Changing Surface

Questions Why does Io have volcanoes? Why don't other moons have volcanoes? TIDES!!!!

1) So, why does Io even have volcanoes? * Close to a massive object. * Large moon, so it feels a big difference in gravity between near side and far side. * Wants to get into circular orbit, but resonant moons keep pulling it into an eccentric one. * Plus, other moons produce tides, too.

Why don't other moons in the Solar System have volcanoes? * Other moons aren't close enough (e.g. Europa)... *...or they're not orbiting a huge planet (e.g. Earth's Moon)... *..or, other moons aren't large enough to feel large differences in gravity between near and far side (e.g. Amalthea).

Blackbody Radiation - radiation emitted by a body which perfectly absorbs at every wavelength

Account for Surface Area