1. Which statement is NOT true regarding our Solar System? A. The terrestrial planets have higher densities than the gas giants.

B. The gas giants all have several moons.

C. The Sun is the center of our Solar System.

D. Earth is the smallest of the gas giants.

2. Which statement about relative astronomical size is correct?

A. The diameter of Earth is bigger than the diameter of the Sun.

B. Our Solar System is bigger than the Milky Way galaxy.

C. Asteroids are the largest of the minor bodies in our Solar System.

D. The orbit of our Moon is smaller than the dwarf planet Pluto.

3. It would be appropriate to use Astronomical Units (AU) to measure the distance between which of the following?

A. Atoms

B. Galaxies

C. Countries

D. Planets

4. What is the primary difference between a moon and a planet?

A. Planets are always larger than moons.

B. Moons orbit planets and planets orbit the Sun.

C. Moons have a greater mass than the planets that they revolve around.

D. Planets are spherical, and moons are more irregularly shaped.

5. Which statement is true regarding measuring distances in space?

A. An astronomical unit (AU) is larger than a light year.

B. The time taken for light to travel through our Solar System is longer than that for light to travel through the Milky Way.

C. The Earth is one astronomical unit (AU) from the Sun.

D. All of the terrestrial planets are more than one astronomical unit (AU) from the Sun.

6. The inner terrestrial planets all have similar compositions with rocky surfaces and high densities. They are very different from the outer planets, called the gas giants. The gas giants all have similar compositions and they are much larger with low densities. Despite these differences, what is one characteristic that the inner and outer planets share?

A. They all have moons.

B. They all are more than one light year away from the Sun.

C. They all travel in elliptical orbits.

D. They all have equal periods of rotation.