I tried to explain to @kingabesh what I.know but I still have two questions: do any gamma rays reach the surface of the earth? And if so isn't space supposed to be empty? what's stopping gamma rays from reaching the atmosphere ?
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Most won't. Very rarely, some might, but it is not possible to detect them as really really really too rare.
In average, space is empty. But there is stuff in it here and there.
Gamma rays can reach the atmosphere. The atmosphere is actually the stuff protecting us from them :)