An orbit is the path an object in space takes while it moves. Generally objects in space such as planets and comets take elliptical orbits around larger objects, such as a star.

An asteroid is a combination of rocks and iron that is too small to form a planet. There are many asteroids that orbit the sun between the orbits of Jupiter and Mars.

A comet is a small body of gas and ice orbiting around the solar system. We can see the tail of the comet because it is the sun heating and melting the ice. The most famous comet is Halley's Comet which is visible from Earth every 75-76 years. The last time it appears was in 1986 and will next appear in 2061.

A star is made up of clouds of gas and dust. Many people love to go outside at night and count the stars, but there are so many that it is impossible for one person to count them all.

A constellation is a group of bright stars that form shapes or 'pictures' in the sky.

The galaxy we live in is called the Milky Way. It is made up of billions of stars.

A telescope is an instrument which has reflective lenses that allows us to see the objects in the sky closer and clearer. It magnifies objects that normally cannot be seen unaided. 

An astronaut is a person who leaves Earth and goes into space. Many of them work in the international space station and do scientific experiments. Astronauts need to wear space suits because it is very cold in space and they do not have oxygen to breath.

A spacecraft is any type of vehicle used for travelling in space. There are many different types of spacecrafts. Aspace shuttle is a spacecraft used for repeated use in between earth and a space station and contains astronauts.

A rocket is the type of plane that astronauts used to use to fly into space. Now they are used to leave satellites in orbit around the Earth. It has a special cylindrical shape so that it can go very fast for a long distance.