Even if we don't destroy ourselves, we always have the Universe to contend with.
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A measure of biodiversity, and changes in the number of genera that exist at any given time, to identify the most major extinction events in the past 500 million years. They are not periodic, and only the most recent one has a known cause.At least five extraterrestrial scenarios are capable of wiping humanity out.
What we perceive as a gamma ray burst is now known to have at least one identified cause: in merging neutron stars. If one of the jets from these mergers is pointed at Earth, and is close enough , it could destroy the ozone layer, which would lead to humanity's demise.If one occurred within 6,000 light-years of Earth, it would destroy our ozone layer, causing a mass extinction.
An optical composite/mosaic of the Crab Nebula as taken with the Hubble Space Telescope. The different colors correspond to different elements, and reveal the presence of hydrogen, oxygen, silicon and more, all segregated by mass. If the Earth were located within this nebula, which extends about 10 light-years across at present, it could cause an extinction-level event for humanity.: these have affected Earth many times, but we have endured without significant harm.
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