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First broadcast in 2006, this Horizon episode looks at various researchers investigating the possibility that life on Earth arose via a ‘seeding’ from space, also known as the theory of ‘panspermia‘ (first proposed by Fred Hoyle and Chandra Wickramasinghe in the 1960s):

Features include the mysterious ‘red rain’ that occurred in India a few years ago, and projects designed to look for life on other bodies in our Solar System.