He uses his time alone in the dark to perfect his understanding of what is to come. His ultimate goal is far beyond the awesomeness of Galactic Dynamics and Stellar Evolution, it is:

THE CREATION OF INDEPENDENT CONSCIOUS LIFE!

But in order to accomplish this he needs metallic planets rich in carbon, oxygen and many other elements, NONE of which exist yet...

So much depends upon

the triple alpha process

in the core of a star

that has run out of hydrogen.

To while away the time while he waits for the hydrogen to finish aggregating and for his punishment to end he solves Chess, derives the electron cloud distribution of Oganesson from first principles, and, among a vast raft of other transcendental mental gymnastics, using his Calculus of Numerical Techniques he derives a general solution for n bodies in a space of n dimensions.