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We linked to various instalments of this series as they were posted way back, but it’s worth a recap. The Astrobiology website has a six-part series titled “Complex Life Elsewhere in the Universe“, in which various experts put forth their view on the possibilities of alien life. Those involved include SETI pioneer Frank Drake (author of the well-known ‘Drake Equation’ for estimating the likelihood of alien life); Peter Ward and Donald Brownlee, the authors of Rare Earth, which suggested we are a unique development in the history of the Universe; and last but not least astrobiologist David Grinspoon, author of Lonely Planets. It’s a fascinating survey of scientific opinion on the idea of alien life, and worth reading just for Grinspoon’s out-of-the-box ideas.