Heather Couper considers the prospects of life being found elsewhere in the solar system.
Dr Nick Lane of UCL talks about studying the origin of life on earth with Jim Al-Khalili.
Robin Ince and Brian Cox are joined by Jon Ronson and Seth Shostack from SETI Institute.
Melvyn Bragg and guests discuss our chances of ever discovering life on another planet.
Melvyn Bragg and guests discuss extremophiles and astrobiology.
Professor Monica Grady searches for signs of life on Mars.
Frontiers looks to the heavens this week, and asks: are we alone?
How do we look for alien life, and what are we expecting to find?
Are intelligent aliens out there?
Dr Lucie Green reports on plans for a radio telescope the size of a continent.
Melvyn Bragg and guests discuss the Cool Universe.
Brian Cox and Robin Ince head to San Francisco to talk aliens and UFOs.
The riddle of the 19th-century French meteorite that carried a secret for 100 years.
Melvyn Bragg and guests discuss when and how life on earth originated.
Robin Ince and Brian Cox are joined by rationalist comedian and musician Tim Minchin.
Sir Fraser Darling asks who is responsible for the protection of the natural world.
The work by contemporary astronomers to find other planets like Earth in the universe.