Quiz 9

1. How fast does the Moon rotate?
a. At the same rate as it revolves around the Earth, once a month.
b. At the same rate as the Earth's rotation, once every 24 hours.
c. At the same rate as the Earth revolves around the Sun, once a year.
d. The Moon does not rotate, it only revolves around the Earth.

2. Have any spacecraft from Earth landed on the Moon?
a. No, NASA has not yet sent any mission specifically to the Moon.
b. No, the Moon has been orbited by spacecraft, but not landed on.
c. Yes, unmanned spacecraft have landed on the Moon in the 1970's.
d. Yes, and a total of 12 astronauts have walked on the Moon so far.

3. Why doesn't the Moon have an atmosphere?
a. Because its gravity is too weak for it to retain the atmospheric gases.
b. Because the Moon is always cold, and its atmosphere froze.
c. Because its atmosphere was swept away by an impact with a large object.
d. Because of the disruptive effect of Earth's magnetic field.

4. How far is Mars from the Sun?
a. Half of our distance from the Sun.
b. 1.5 times our distance from the Sun.
c. 5 times as far as the Earth.
d. 20 times as far as the Earth.

5. At what time on Thursday (section 1) or Friday (section 2) would you be able to go to an extra lab? (If you paln to attend an extra lab.)