Question: Supernova SN1987A was first visible at Earth in 1987. (a) How many years B.P. (before present) did the explosion occur? (b) If protons with 100

Supernova SN1987A was first visible at Earth in 1987.

(a) How many years B.P. (before present) did the explosion occur? 

(b) If protons with 100 GeV of kinetic energy were produced in the event, when should they arrive at Earth?

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