Why are no impact craters seen on Io?
|A)||it does not have a solid surface|
|B)||it has extensive volcanic activity|
|C)||it was very recently captured by the solar system|
|D)||its icy surface heals very rapidly|
The heat that keeps the interior of Io molten is due to
|C)||frequent meteoroid impacts|
|D)||a large greenhouse effect|
Suppose a planet is orbited by a number of satellites. Which of the satellites will feel the strongest tidal forces due to the planet?
|A)||a large satellite in a close orbit|
|B)||a large satellite in a distant orbit|
|C)||a small satellite in a close orbit|
|D)||a small satellite in a distant orbit|
The surface of Europa (Jupiter's satellite) is very smooth. Why?
|A)||it has been scoured by high winds|
|B)||it is covered by lava flows|
|C)||meteoroidal impacts have pulverized the surface|
|D)||it is covered by frozen water|
What is remarkable about the surface of Ganymede?
|A)||it shows evidence of ancient tectonic activity|
|B)||it is the most heavily cratered surface in the solar system|
|C)||it contains pockets of liquid water|
|D)||it is dotted with many volcanoes|
What are the bright patches on the surfaces of Callisto and some of the satellites of Saturn?
|B)||regions of freshly exposed ice|
|C)||stretches of open water|
|D)||small dust storms|
Why are the inner Galilean satellites denser than the outer ones?
|A)||the outer ones contain more icy material|
|B)||the inner ones contain more iron|
|C)||the inner ones are larger|
|D)||the outer ones are made mainly of gas|
The satellites of Saturn, Uranus, and Neptune are made mostly of
Which of the following correctly describes the atmosphere of Saturn's satellite, Titan?
|A)||thick, made of nitrogen, cold|
|B)||thick, made of carbon dioxide, warm|
|C)||thin, made of nitrogen, warm|
|D)||thin, made of carbon dioxide, cold|
What is remarkable about Uranus' satellite Miranda?
|A)||it has a bizarre appearance|
|B)||it has a small ring system of its own|
|C)||it has a much higher temperature than the other satellites of Uranus|
|D)||it is almost perfectly smooth|