Could an exploding star kill all life on Earth? -- If it was close enough, then yes. Astronomers predict that if a supernova were to explode within 30 light years of us, a mass extinction would be possible. X-rays and the more energetic gamma rays brought about by a star’s explosion would destroy Earth’s ozone layer and ionise nitrogen and oxygen in the atmosphere, leading to the formation of large amounts of smog-like nitrous oxide in the atmosphere.
These plough marks in the central Barents Sea were likely formed by huge flat-bottomed floating icebergs, bigger than the ones floating in the Arctic today. Credit: Courtesy of British Antarctic Survey
Scientists will live in a dome for 8 months to simulate Mars
HONOLULU (AP) — Six carefully selected scientists have entered a man-made dome on a remote Hawaii volcano as part of a human-behavior study that could help NASA as it draws up plans for sending astronauts on long missions to Mars.
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