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This Public Broadcasting Service (PBS) activity explores the controversy over whether or not there is life on Mars. Part of the Mysteries of Deep Space Program that originally aired in April 1997, the activity includes...
This National Academy of Sciences scholarly paper discusses the strongest line of evidence for past life on Mars based on NASA's David McKay's original claims of finding nanofossils on the ALH84001 meteorite. This study...
This article discusses the history and future of planetary-protection restrictions. It begins by addressing the difficulty of discovering (possibly rare) life elsewhere, and then describes the potential difficulties of...
This on-line news article introduces the Goldilocks Zone, an area of space adequate for the survival of life. Initially believed to be a remarkably small region of space that didn't even include the whole Earth, recent...
This National Aeronautics and Space Administration website provides a summary of a study led by NASA's David McKay that may provide evidence for past life on Mars. McKay and his team found carbonate globule features on...
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