What is Exogeology?
Exogeology (also called planetary science or planetary geology) is the science of the geology of other worlds. So, exogeologists get to find out how other worlds work: how they formed, what they’re made of, and what’s happening to them right now! Exogeologists need to know a lot about geology and astronomy, since exogeology combines them.
What is astronomy? Astronomy is the study of space. Astronomy includes things like stars, planets, comets, galaxies, and other things in the universe.