Asteroid - a small body of rock and ice orbiting the Sun
Atmosphere - the layer of gas around a planet
Comet - a comet is an icy bright object that passes through space leaving a tail of ice and dust behind it.
Galaxy - a system of billions of stars all orbiting a central point
Gravity - the force that attracts a moon to a planet or a planet to a star
Meteor - a small piece of matter from outer space, up to the size of a boulder
Milky Way - the galaxy that we live in
Moon - a celestial body that makes an orbit around a planet. Earth has just one, called The Moon.
Orbit - the path that a moon takes around a planet, or the path that a planet takes around the Sun.
Planet - a large, round object in space that moves around a star
Shooting star - a meteor that is passing through the Earth’s atmosphere and has got so hot that it glows in the night sky.
Solar System - the Sun and collection of stars
Star - a large ball of very hot gases, that gives off lots of light and heat
Sun - the star around which the Earth orbits
Universe - everything that exists – all the stars, all the galaxies, all the planets and everything in between
Year - the length of time it takes the Earth to travel around the Sun
