Quizzes - Astronomical Physics

* The chaos coalesces. Gravitational attraction brings tiny bits of matter together. But there are points at which there is neither matter nor electromagnetic radiation. Still, a strange quantum-mechanical potential lurks there. Which of these could it be?
* On a tiny blue planet orbiting a seething gaseous ball, somewhat intelligent life notices a baffling phenomenon. When they take an empty box and punch a hole in it, radiation streams out from the black interior of the empty box. What name is given to this radiation?
* Other denizens of the small blue planet occupy their time with attempting to suck every last molecule out of closed containers to produce a perfect vacuum. Which of the following are examples of a truly perfect vacuum?
* The creatures of the little blue planet have fertile imaginations. They can, for instance, imagine an infinity of nothing, a place with infinite volume where there is neither matter nor energy. And having imagined such an absolutely desolate place, what temperature do they assign to it?