ZNP
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- Feb 20, 2020
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So, in the last 2,000 years how many supernovas have occurred with stars closer than Betelgeuse?Betelgeuse is about 197 parsec from earth,
Number of Stars = density * volume
= 0.120 stars/cubic parsec * 4/3 pi (197 parsecs)^3 = 3,842,984 stars as close or closer than Betelguse.
In 30 parsecs We expect a supernova once every 8.6 million years.
In 61 parsecs We expect a supernova once every every million years,
In 153 parsecs We expect a supernova once every every 69,000
In 306 parsecs We expect a supernova once every every 8,625 years
So for Betelgeuse distance, about one every 40,000 years just a fraction of the earth's age.
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