Threat to life! NASA scientists identify new stellar danger to planets
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Astronomers using data from NASA's Chandra X-ray Observatory and other telescopes have identified a new threat to life on planets like Earth: a period during which intense X-rays from exploded stars can affect planets over 100 light-years away.The finding, published recently in The Astrophysical Journal, has implication for the study of planets outside the solar system and their habitability. This threat comes from a supernova's blast wave striking dense gas surrounding the exploded star. When this impact occurs it can produce a large dose of X-rays that reaches an Earth-like planet months to years after the explosion and may last for decades, the researchers said. Such intense exposure may trigger an extinction event on the planet, they said.The study is based on X-ray observati...