How do cracks appear in spacetime? What does it have to do with symmetry?
Aug 6th: What are the mysterious cosmic strings?
Tag: Ask A Spaceman
Jul 16th: What do we learn from eclipses?
Why is it so hard to predict solar eclipses? How did Newton and Halley team up to solve it? What have we learned from solar eclipses since then?
Jul 2nd: Is Interstellar Travel Possible?
How hard is interstellar travel? What are the possible ways to achieve the required energy?
Jun 18th: How Do We Measure The Expansion Of The Universe?
What’s the deal with redshift? How can we actually interpret velocities when it comes to cosmic expansion?
Jun 4th: Is everything a wave or a particle, and why does my head hurt?
Is light made of waves or particles? Is matter made of waves or particles? What does it mean for matter to “wave”, anyway?
May 21st: What turned Venus into hell?
What’s so bad about Venus, besides everything? How did it get so bad? How about Earth? @PaulMattSutter will answer the questions at #365DaysOfAstro
May 7th: What’s Wrong With the Cosmic Calendar?
What is the “cosmic calendar”? What are some important scales in the universe?
Apr 16th: What are the mighty clusters of galaxies?
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?
Apr 2nd: What is the black hole information paradox?
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!
Mar 19th: Why Avoid the Cosmic Voids?
How do cosmic voids form? What do they teach us about dark energy? What did the early universe look like?