Answer. All those heavy objects which are present in space, such as the sun, the moon and other bodies are called celestial bodies. Examples are the sun, the moon, the planets, asteroids, meteoroids, etc. The sun is a body that is called the centre of the solar system which it binds with its pulling force. It is made up of huge gases such as hydrogen and helium. Its mass is 99.8% of the total mass of the entire solar system. It is almost 150 mn km away from our planet and is a huge source of heat and energy.