How much energy is needed to blow up the sun? How is this connected to the idea of binding energy? Where is all the energy in the universe?
What do brown dwarfs teach about stars? What do they teach us about planets? What keeps them warm, and how long do they live?
What are the many sources of light in the universe? Why is a spectrum so important? What’s the difference between synchrotron and Cherenkov radiation? What’s the best word ever in physics?
What does the Drake Equation teach us about extraterrestrial civilizations? What does it NOT teach us? What complexities does it hide? Is it even science?
What’s the connection between motion and magnetism? How can something like a black hole have a magnetic field? What’s the connection to quantum mechanics? How did Einstein use magnetism to develop special relativity?