91Èȱ¬

The solar system consists of the Sun surrounded by planets, comets and asteroids in orbit. Most planets in the solar system have moons in orbit around them.

Stars are formed from massive clouds of dust and gas in space. The time they burn for and their life cycle depend upon their size.

Big Bang theory explains how the Universe was formed and why it is still expanding. Space exploration uses a variety of manned spacecraft, space probes and telescopes.