1.
When meteorites or other objects strike the Moon, they create _____________.
A. 
B. 
C. 
D. 
2.
The Sun and all objects orbiting it make up the solar system.
3.
The second largest gas planet has the lowest density and hundreds of thin rings composed of rock and ice is ____________.
A. 
B. 
C. 
D. 
4.
Johannes Kepler discovered that the orbits of the planets are _____________.
A. 
B. 
C. 
D. 
5.
The second planet from the sun that is very hot and has sulfuric acid clouds is __________.
A. 
B. 
C. 
D. 
6.
One of the gas giants, _________, has an axis of rotation nearly parallel to the plane of its orbit.
A. 
B. 
C. 
D. 
7.
The two planets with similar mass and size (sometimes called the twin planets) are _______.
A. 
B. 
C. 
D. 
8.
The planet that averages 150 million km (93,000,000 miles) or one AU, from the Sun is _____.
A. 
B. 
C. 
D. 
9.
______________ is the largest moon in the solar system.
A. 
B. 
C. 
D. 
10.
The largest known volcano in the solar system is an extinct volcano known as Olympus Mons found on the planet ________.
A. 
B. 
C. 
D. 
11.
The planet closest to the Sun is __________.
A. 
B. 
C. 
D. 
12.
The planet that appears reddish-yellow due to iron oxide in its rocks is ____________.
A. 
B. 
C. 
D. 
13.
The largest of _____________ moons, Titan, is larger than the planet Mercury
A. 
B. 
C. 
D. 
14.
The Great Red Spot, a continuous storm, is located on the planet__________.
A. 
B. 
C. 
D. 
15.
Methane gives ___________ their blue-green color.
A. 
B. 
C. 
D. 
16.
The solid portion of a comet is called its _____________.
A. 
B. 
C. 
D. 
17.
A cloud of gases around the solid portion of a comet is known as the ____________.
A. 
B. 
C. 
D. 
18.
A __________ consists of small pieces of dust and rock moving through space.
19.
_________ published the Sun-centered model of the solar system in 1543.
A. 
B. 
C. 
D. 
20.
When small pieces of rock moving through space enter Earth's atmosphere and completely burn-up they are called __________.
21.
Pieces of rock that actually strike Earth's surface are called ____________.
22.
Most asteroids are located in an area between the orbits of __________________.
A. 
B. 
C. 
D. 
23.
Earth completes a full rotation on its axis once every __________________
A. 
B. 
C. 
D. 
24.
In the northern hemisphere, the _________________ occurs on June 21 or 22
A. 
B. 
C. 
D. 
25.
A ________ occurs when the Moon moves directly between the Sun and Earth and casts a shadow on Earth
A. 
B. 
C. 
D.