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Questions from the lecture on Friday, November 20.

(180)

What is the origin of the plasma (plasma just means hot, ionized gas) torus that marks out the path of Io's orbit?

(181)

Although Europa is completely covered by ice (giving it the highest albedo of any object in the solar system), we know that it is mostly rocky. Explain how we know this.

(182)

What makes the surface of Europa so young (such a low crater density, bright coloring)? Explain why we think Europa is one of the most likely objects in the solar system besides Earth to have life as we know it.