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Well, what does it mean? Each time a piece of debris falls you have probability p = 10^-12 of it hitting you? Or there’s probability p every day that there will be a piece of falling debris? Or p chance of being hit across a lifetime?

Extremely events do indeed happen regularly if you have enough rolls of the die.

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Maybe it's one in a trillion that a particular piece of space junk, not already known to be falling from the sky, will fall and hit a particular person. This seems quite scary since the product of the number of people and the number of pieces of space junk is much more than a trillion.

The question GP is really getting at though is "1 in a trillion per what?".

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