[stargazer-3]

Around 5e-14 per year, assuming random impact location, small (i.e. not town-sized) projectiles, and head impact cross-section the size an A4 paper.

You can sleep safely. Waiting for 10^14 years will take a while - by that time, no new stars are born in Milkomeda, and the Sun's white dwarf remnant has cooled down to a point of no longer being visible by naked eye. (edit: of course, it's not reasonable to assume that the 500 impacts / year will be constant till the end of time)

Hitting a random human on Earth, though, is a munch higher likelihood - around 0.04% per year if I did my numbers right.

[undoware]

thank you <3