... but hangs in iOS4

This app makes gravity visible! You can see the deformation as the galaxies approach each other from every angle imaginable. Double the mass of one and watch it tear spirals of stars away from another. Wanna go mental? Try watching 3 galxies slam into each other - the possibilities really are endless!
Any chance of adding a time scale (eg millions of years or multiples of speed of light) to the collisions? Maybe start with some assumption about the size of 1 interstellar unit? These are not complaints, merely suggestions. I love this app!

Just another Canadian about Galaxy Collider