Space is the name we use for everything beyond Earth.
Most of space is almost empty and behaves like a vacuum. There is very little matter between stars and planets.
Stars and planets are grouped together inside galaxies. Many stars have surrounding systems that include moons, asteroids, and comets. Some galaxies contain clouds of cosmic dust that can form new stars.
Much of the information we have about space comes from the light from distant objects. Changes in gravity, such as gravitational waves, also provide information about space.
The study of space covers a wide range of scales, from atoms inside stars to the beginning and possible end of the Universe.
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