Hubble measures the Universe's expansion.
The brightness of stars can change.
The Sun is one of countless stars in our galaxy.
Marcy finds hundreds of planets orbiting distant stars.
Astronomy's most important tool continues to evolve.
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.