1
These are the gas planets. (two words)
2
These are the terrestrial planets. (two words)
3
This is the location in the solar system between the inner and outer planets where these objects tend to cluster. (two words)
4
This is the group of objects held together by our Sun. (two words)
5
This tool, invented in the 17th century, is used to study the universe.
6
This is the new name for a meteoroid that falls to Earth and lands on Earth’s surface.
7
This object varies in mass and size. It is a smaller version of an asteroid and is found in space.
8
This is the larger version of a small rock in space. They vary in size and mass.
9
This outer planet is farthest from the Sun at 4.5 billion kilometers.
10
This terrestrial planet has no moon and is 58 million kilometers from the Sun.
11
This gas planet has an atmosphere made of mainly hydrogen. It has dozens of moons.
12
This is any large celestial body that revolves around the Sun in the solar system.
13
This object is what a meteoroid is called when it enters Earth’s atmosphere.
14
This gas planet takes 29 Earth years to revolve around the Sun.
15
This outer planet takes 84 Earth years to revolve around the Sun. It also rotates “backwards.”
16
This object is made of frozen gas, rock, and dust. It can have a “tail” when it gets close to the Sun.
17
This was sent to Mars to collect data about the planet.
18
The atmosphere is mainly nitrogen and oxygen. It is a terrestrial planet.
19
This planet is closest to Earth. It has an atmosphere that is mainly carbon dioxide and a small bit of nitrogen.
20
This terrestrial planet has almost the same rotation period as Earth. It is about 228 million kilometers from the Sun.
21
This is a celestial object that orbits a planet.
22
This object is the largest object in our solar system. Its gravity holds the solar system together.
