Create Stars in After Effects
Make an infinite loop through a starfield.
Use Loop Control to keyframe the loop.

DOWNLOAD LOOP CONTROL
https://www.dpalmermotion.com/loopcon...

Loop Control takes a PreComp you want to loop, and provides a control to keyframe the speed and time of the loop as much as you want.

0:35 - I used FX Console to quickly select an effect without going to the effects and presets panel.
You can get this for free here... https://www.videocopilot.net/blog/201...