Shooting Stars

I've been wanting to do this one for quite sometime now but wasn't sure how to make it, but I finally decided to make it like this.
Btw, you know how people tell you to save constantly so that if your computer or software crash you don't lose everything?

Well, I didn't take take that advice and suffered the consequences at 4am. Although I didn't lose EVERYTHING, but it definitely wasn't fun.

Anyway, I made several speeds of this, but the original was a bit to fast I think so I slowed it down a little so you can see what's going on here. I think the picture is pretty self explaining