Some asteroids can be pulled towards the Earth by the force of ________

Asteroids are objects in space which are made out of __________

A huge, red-coloured star that is formed when a massive star expands towards the end of its life,

An asteroid that enters the atmosphere.

The idea that a large object roughly the sane size and mass as the planet Mars collided with the Earth, releasing rocks that were pulled together to form the Moon.

The piece of rock left behind after a meteor collides with the Earth's surface.

The explosion of a massive star at the end if its life, which produces a nebula

a cloud of interstellar dust

The idea that the Moon and Earth formed together, close to each other, at the same time.

Respiration is the __________ of carbon dioxide, while photosynthesis is the sink.

When plants and animals decomposed, _________ is released in the air.

A dense part of a nebula in which new stars are formed

The roundness of the Moon suggests the Moon has formed and been made stable mainly due to its ___________.