Probably just run the whole universe backwards through time from its current state until it reaches some unchanging state, and then run it forwards again from the beginning.

In time lapse of course, I am a mortal after all.

Should be able to answer a metric shitton of astrophysics questions, at very least, which do happen to be some of the absolute most-asked and hardest-if-not-impossible-to-conclusively-answer questions in science. Period.