What is a light year?
Gravity gathers stars, gas, dust and dark matter.
The Seven Sisters star cluster has at least 1,000 stars.
Marcy finds hundreds of planets orbiting distant stars.
This facility is home to one of the world's largest radio telescopes.
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.