i figure the number of particles is 4 per (3.1*10^18)^2.
and no, i don't expect there to be a collision with the sun and another star. that's one of the reasons i posted this question. it seems almost absurd. but it's a homework problem nonetheless.
any help is appreciated.
The problem is assume Andromeda and the Milky Way are going to collide. the relative speed of them moving is 10^6m/s. assume each star has the radius of our sun (6.955*10^8m) the distance between each star is 3.1*10^18 m. how long will it take for a star to collide with...