What does high-speed motion through the universe do to your perspective? What is the Rindler horizon, and how does it appear? Would you get vaporized by a high-energy bath of radiation?
What really keeps the Sun shining? How long would it stay warm if fusion stopped? How long would it take before we noticed?
What are the weaknesses of inflation theory? How did the ekpyrotic theory attempt to improve it? How did it open up its own can of worms?
Why is dust so annoying? But where does it come from, and what can it do? And is dust responsible for the creation of life?
What does is mean for the universe to have a wave function? How does Hawking’s “no boundary” proposal mean that the universe comes from itself? And is it really the final answer?