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How long does it take a white dwarf star turn supernova?

April 26, 2017Astronomy Dwarf forum forums star SuperNova telescope turn white

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How long does it take a white dwarf star turn supernova?

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Lets look at sirus b a white dwarf star 8 light years away.If astromoners found out tomorrow that Sirus b was turning super nova.How long would that give us before the gamma rays from the super nova wipes us out.Will the people on the oppisite side of the earth from the gamma radiation receive the same amount of radiation and will going underground help save us.