Extraterrestrial life is a common theme in
science fiction, but is it a serious prospect in the real world? Astrobiology
is the emerging field of science that seeks to answer this question.

The possibility of life elsewhere in the cosmos
is one of the most profound subjects that human beings can ponder. Astrophysicist
Andrew May gives an expert overview of our current state of knowledge, looking
at how life started on Earth, the tell-tale ‘signatures’ it produces