Invisible matter helps to hold the Universe together.
Beautiful dust and gas clouds are found in interstellar space.
Stars are born inside this cloud of gas and dust.
Hoyle puts forward an alternative to the Big Bang.
An underground lab is part of the dark matter search.
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.