if the universe is expanding, how comes stars collide?

Answer 1

Although the universe in total is expanding, that doesn't mean every star in it is heading in the same direction or at the same speed, It would seem statistically possible that despite the vastness of space, some stars would eventually be drawn into a collision once one approaches too close to another's gravitational field or one's path intersects another. In fact, galaxies with billions of stars have collided (still even then, most of these stars don't collide with another star).

Answer 2

Great question:

The initial elements of the Big Bang, the original stars, also go BANG.

So now you have different vectors introduced. The second generation stars also explode after a time, and again, more vectors are introduced.

The result is a chaotic mess in which particles collide, stars collide, even galaxies collide...

Quite cool really...

-dh

Answer 3

universe expands due to dark matter and gravity
Stars collide due to gravity.

Answer 4

because they are moving, and no matter how much room you have, when two things are moving in different paths that arent parallel to each other in any way, they will eventually collide.

Answer 5

Doesn't matter how big a room is, if you put enough people into it, eventually two are going to bump into each other.

Same concept, different location.

Answer 6

the expansion of the universe is only a theory to explain evidence that otherwise points to Intelligent Design, but is stigmatized by biased members of the scientific community. it may be true, but like anything that cannot be dirrectly proven, has holes that have yet to be plugged.

Answer 7

Because the expansion is not totally regular.

Answer 8

cos nuclear forces attract