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UFO files: CIA unveils reports of flying saucers in SheffieldIn Depth US intelligence agency has rounded up some cases that Mulder and Scully might enjoy
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Have astronomers identified 'sweet spot' for alien life?Speed Read Experts suggest star clumps could harbour networks of civilisations
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Nasa discovery boosts hopes of life on MarsSpeed Read US space agency to send astronauts 'in near future' after evidence of flowing water found on red planet
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Human-like aliens 'almost certainly' exist, says evolutionary biologistSpeed Read Simon Conway Morris argues that human-like species could easily evolve on any other Earth-like planet
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