What did Hubble really discover? Why does redshift imply an expanding universe? Why is the night sky dark? Why is there so much hydrogen, and how is that connected to the Big Bang?
Ask A Spaceman Archive
Jan 16th: How Does Gravity Make a Lens?
How does gravity bend the path of light? Does it seriously act like a lens or is that just a metaphor?
Jan 2nd: Who Lives in the Particle Zoo?
What strange creatures inhabit the so-called “particle zoo”? Why is it a zoo instead of something simpler?
Dec 23rd: Atacama AstroTour Special
Dec 19th: Are quark stars real?
Dec 5th: What makes a blazar blaze so brightly?
Nov 21st: Do we live in a hologram?
What’s the idea behind the holographic principle? What does it have to do with black holes and the early universe?