Quiz 10

1. Is there, or has there been, water on Mars?
a. No, Mars has always been a totally dry planet.
b. There used to be, but what remains of it is probably all frozen.
c. Until now there wasn't, but we can see lakes starting to form.
d. Yes, Mars is the only other planet that has liquid water.

2. How does Jupiter's radius compare to that of the Earth?
a. It is slightly smaller than the Earth's.
b. It is about twice as large as the Earth's.
c. About 11 times as large as the Earth's.
d. About 100 times as large as the Earth's.

3. Does Jupiter have moons?
a. No, we don't know of any so far.
b. Yes, one moon, the largest in the solar system.
c. Yes, four moons, that were first seen by Galileo.
d. Yes, more than 60, four of which were seen by Galileo.

4. How large are the largest asteroids?
a. The largest known ones are football-sized.
b. Like boulders, at most 2-3 meters.
c. A few are between 100 and 200 m wide.
d. Many of them are hundreds of miles across.

5. What is the asteroid belt?