Peter Davenport, Director of the National UFO Reporting Center in the US, speaks to Louise Ridley about taking the scientific approach to finding alien life
The Astronomy Photographer of the Year 2010 winners have been announced. Here's BBC Focus magazine's guide to the best in space photography this year.
Gamma-ray bursts – or death stars – are the most violent events in the Universe. Robert Matthews asks if we've already been devastated by one, and what an explosion would do to us in the future.