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100

A small rocky body orbiting the sun. Large numbers of these, ranging enormously in size, are found between the orbits of Mars and Jupiter, though some have more eccentric orbits.

Asteroids!

100

A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.

A galaxy!

100

the collection of eight planets and their moons in orbit round the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.

Solar system!

100

a vehicle designed for travel or operation in space beyond the earth's atmosphere or in orbit around the earth.

A spacecraft

200

It is the path one object in space takes around another.

Orbit!

200

These are basically dusty snowballs which orbit the Sun. They are made of ices, such as water, carbon dioxide, ammonia and methane, mixed with dust. These materials came from the time when the Solar System was formed

Comets!

200

It is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body.

The atmosphere! 

200

a group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure.

A constellation!

400

What is the closest galaxy to the Milky Way?

Andromeda

400

The earth is said to do this as it turns or spins on its axis.

Rotate 

400

The earth's orbit is the path Earth takes as it does this around the sun.

Revolve!
400

This separates the inner planets from the outer planets.

The asteroid belt!

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