As the Rosetta spacecraft awakes, Dr Natalie Starkey takes us through this extraordinary comet-landing mission.

Forensic engineering enables us to analyse the 1986 Challenger disaster

Join us on a virtual journey to explore the science behind the Huygens probe sent to explore Titan, one of Saturn's mysterious moons. To help you get to grips with the way the technology works, we're going to send our probe to somewhere a little more familiar than Titan - and much closer to home...

How did the solar system form? Are we alone in the Universe? What are alien atmospheres made of? These questions can be answered by studying the solar system's vast family of satellites. This collection of videos looks at five of the most intriguing worlds that we've managed to visit over the last fifty years, including The Moon, Europa, Phobos, Deimos and Titan. From the first human footsteps on another world to the most distant spacecraft landing in history, our neighbourhood of moons has always played a central role in our exploration of the planets.

For an introductory astronomy course, try The Open University course S194 Introducing astronomy.

The spacecraft Hipparcos produced a range of staggering stereoscopic star maps, as Dr Alan Cooper explains