What happens to a white dwarf when it cools off? How long does it take? Do they just stay black forever, or will something more interesting happen to them someday?
How did we discover the weak nuclear force? Why is it so strange compared to the other forces? What do mirrors have to do with all of this?
Is the universe infinite? What about the cosmological horizons, the limits to what we can see? Will we ever know for sure what’s beyond them?
Why did we develop the International Space Station in the first place? What have we learned in its 25+ years of operation? When is it coming down, and why? And what’s coming up next?
How do particle colliders work? What kinds of energies are we talking about? Are there any uses for colliders except for physics experiments?