What is the “missing baryon problem”? How do we know how many baryons there ought to be? What does the cosmic web have to do with it? What the heck is a baryon, anyway?
What was Newton’s genius? Why was his work so controversial? Why are his laws of motion so radical?
What makes the Earth’s atmosphere so special? What makes the atmospheres of other planets so special? Why are atmospheres so special anyway?
Why do we think the solar system might have another planet? Why do we think it doesn’t? How do test for something that’s too far away to see?
Why is the speed of light so important in physics? Why does the value not matter at all? And why does it have the speed that it does? I discuss these questions and more in today’s Ask a Spaceman!