1
Distances in space are measured in...
2
Between the inner and outer planets, there is a belt of...
3
The smallest planet in our solar system is...
4
The explosion that created the universe is called the...
5
The biggest planet in our solar system is...
6
Planets orbit the Sun because of the force of...
7
The Milky Way is a...
8
The Earth is a...
9
The Sun is a...
10
The inner planets are made of...
11
The outer planets are made of...
