re: Relax - Milky Way Collision with Andromeda Further in Future than Earlier Predicted

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Of course this is just a back of the napkin calculation that assumes a uniform distribution of stars, and doesn't account for the pull of gravity between stars. But considering the speed at which the galaxies will collide and the generally huge distances between stars, I think the effect of gravity would be pretty much negligible as far as causing more collisions.

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I'm glad people like you are out there to do the math for me.

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It's pretty easy to come up with a guess. Lots of people have done it. If you think the universe is infinite then there's no question there are more stars than grains of sand. 

Here's a link with some guesses. 

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Well, to be fair, your link is talking about "beaches". I said "grains of sand on earth". Theres a lot of grains of sand below the water on this planet. How deep does all the sand go? I imagine it's probably different in lots of places.

Then there's the whole erosion thing. Do we know how many grains of sand are being produced every day? I'd like to know that number. Of course, it would have to take into account beaches and, you know, the other 99 percent of the planet. Above, or under water.

Let's not forget deserts either.