Effect created by Thomas Francis

First part of this animation:

How To Create:

1. Spawn particles on the shell of a sphere with negative speed and the particles should go to the center.
2. Throw in a bit of drag, high initial velocity and size scaling down to create that fake sense of speed slowdown when it’s closer to the center.
3. Set the “Surface Only” option so they spawn on the outer limits, then turn on the “Velocity” option, and finally play with the “Velocity Scale”, setting it to negative numbers to get the particles moving inward instead of outward.