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In that case, the likelihood that you will live to see Betelgeuse go boom is a good, solid zero.
Some of the scenarios are so unlikely that they are hardly worth considering–for instance, a stellar-mass black hole barreling straight toward our solar system.
But there’s one disaster that falls into the sweet spot.
That’s about 150 times as far away as Alpha Centauri, the nearest star system.
Even at the low end of the distance estimates, Betelgeuse is too far away to do significant damage to Earth.
Not because I’m particularly gloomy (according to my friends and family, I’m actually more of a goof), but because they are fabulous ways to illustrate the workings of the universe.
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They are also great for making you appreciate the delicate set of contingencies that allow us to exist right now, right here on Earth.
Betelgeuse is too far away to significantly ionize Earth’s atmosphere and strip away its ozone layer, for instance.
Don’t get me wrong, it will be spectacular (as illustrated below by Henrykus/Celestia), but probably not deadly.
A great way to evaluate the risk is to look at the consequences of past nearby supernovas.
It’s not easy to find evidence of them (which itself is a strong indication that they don’t pose much of a threat), although one claims to find chemical evidence of two supernova explosions between 1.7 million and 3.2 million years ago.