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Are we alone in the Universe, or are there as many planets supporting life as there are stars in the sky?

About the Author

Dr Rhodri Evans' main area of research is extra-galactic astronomy. For the past sixteen years he has been involved in airborne astronomy, and is part of the team building the facility far-infrared camera for SOFIA. He also does research in star-formation and cosmology and is a regular contributor to TV, radio and public lectures.