Suppose that the red-supergiant star Betelgeuse, which lies some 1400 light-years from the Earth, becomes a Type II supernova. (a) At the height of

Suppose that the red-supergiant star Betelgeuse, which lies some 1400 light-years from the Earth, becomes a Type II supernova. (a) At the height of the outburst, how bright would it appear in the sky? Give your answer as a fraction of the brightness of the Sun (b⊙). (b) How would it compare with the brightness of Venus (about 10-9 b⊙)?

 

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