Invisible matter helps to hold the Universe together.
Hundreds of planets have been found orbiting other stars.
The Sun is one of countless stars in our galaxy.
A 19th century Irish astronomer builds the world's largest telescope.
This project produces 3D maps of the Universe.
Professor Brian Cox and other experts explain the mysteries of the Universe.
Sir Patrick Moore looks back on over 50 years of The Sky at Night.
Experts explain what you can see in the night sky during the autumn.
You can see interesting things in the night sky during the spring and summer.
Find out what you can see in the night sky during the winter months.