What is a light year?
Traces of the early Universe are found.
Stars are born inside this cloud of gas and dust.
An astrophysicist estimates how many civilisations are out there.
The AAO hunts exoplanets.
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.