Randy in outer space

This morning, I dreamed that I was in an astrophysics class. The professor was instructing us in how to fight an interstellar thermonuclear war. She was drilling us on how to climb across the ceiling while collecting and defending stars, planets, and galaxies. There was a film shown in which there was a simulated interstellar war being fought, and the instructor had a sense of urgency about her. Beneath the ceiling was a typical auditorium classroom. During lecture, we used textbooks, but I don't recall any details about them.