Celestial bodies

A small mass travelling through space

• meteor

• asteroid

• comet

• moon

A group of stars that form a pattern and are named after it

• planet

• galaxy

• constellation

• stars

Planet's natural satellite

• star

• moon

• meteor

• comet

A large round object in space that moves around a star

• planet

• moon

• galaxy

• asteroid

A small celestial body that moves around the sun

• asteroid

• comet

• meteor

• planet

Cold weather causes the ... of metal.

• expansion

• contraction

• explosion

• collapse

The ... of the universe takes place as galaxies move further apart.

• expansion

• explosion

• contraction

• collapse

Large stars ... at the end of their lifetime, often forming black holes.

• collapse

• contraction

• expansion

• explosion

Big Bang theorists believe that life on Earth began following a massive ... .

• explosion

• expansion

• collapse

• contraction

One of the ... behind space exploration is to discover other life forms.

• motivations

• constellations

• expansions

• contractions