Thanks a lot for the help!

However, I've been playing around with the expressions and I'm trying to get the particles to die now once they are inside the target sphere, and well, its not working the way I would like.

When I try it one way, the particles die before moving, and then the other way nothing happens. Its almost as if the particles have a world position of 0,0,0 when they are born.

Any thoughts?

Thanks again all!