What are galaxy clusters made of, besides galaxies? How can we use them to understand dark matter? And how can we make pretend ones on a computer?
What is “information” in physics? Why do we think it’s preserved, and what happens to information when it falls into a black hole? Why is this a problem? I discuss these questions and more in today’s Ask a Spaceman!
How do cosmic voids form? What do they teach us about dark energy? What did the early universe look like?
What’s the difference between the universe and the multiverse? Do we live in the multiverse? @PaulMattSutter at #365DaysOfAstro
How did Max Planck accidentally discover quantum mechanics? Why is his constant so special? #AskASpaceman with @PaulMattSutter