What characterizes the 100+ light-year distance from a supernova?
Answer
Minimal to no impact; primarily a spectacular visual event
Radiation intensity follows the inverse-square law, meaning it drops off dramatically as distance increases. Beyond a distance of 100 light-years, the harmful radiation from a supernova is effectively negligible for a planet. Therefore, inhabitants of a planet at this distance would experience no physical threat, but they would be able to observe the explosion as a bright, spectacular astronomical event.
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What a Supernova Would Do to Earth if it Looks Like This - YouTube
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