What’s the deal with redshift? How can we actually interpret velocities when it comes to cosmic expansion?
Is light made of waves or particles? Is matter made of waves or particles? What does it mean for matter to “wave”, anyway?
What’s so bad about Venus, besides everything? How did it get so bad? How about Earth? @PaulMattSutter will answer the questions at #365DaysOfAstro
What is the “cosmic calendar”? What are some important scales in the universe?
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?