5. (Slightly harder!) A supernova releases about thousand times as much energy a

Question

5. (Slightly harder!) A supernova releases about thousand times as much energy as the Sun
will radiate in its lifetime. 99% of that energy is radiated in neutrinos. 18 neutrinos from
Supernova 1987a, (which took place in the Large Magellanic Cloud in, as the name suggests,
1987) were detected in the large vats of water that comprised the neutrino detectors. The
detected neutrinos each had an average energy of 10 MeV. Estimate how many neutrinos from
SN 1987a passed through the Earth without interacting with it.
1

Explanation / Answer

The observations are also consistent with the models' estimates of a total neutrino count of 10^58-wikipedia.

So if 24 observed, (wikipedia) or 18, it doesn't matter, it's 99.99 with a lot more 9s.

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