How did the solar system form? What is a “planet” and who decided that? Just how much space is in space?

How did the solar system form? What is a “planet” and who decided that? Just how much space is in space?
It’s time for school! Astro101 series with @PaulMattSutter will discuss why did people used to study astronomy? Why do they continue to study astronomy?
What does the “emdrive” claim to do? How does it violate almost all of known physics? What were the problems with the experiments? I discuss these questions and more in today’s Ask a Spaceman!
What can possibly replace the singularity? What are Planck stars and Gravastars? What’s it like to fall into a rotating black hole?
When stars die, do their planets die too? What can possibly survive after a supernova explosion? How will the death of the sun affect our solar system? Can zombie planets rise from the dead?
About the Asteroid That Will Destroy Earth Right Before Election Day Hmm really? Listen to today’s space radio with @PaulMattSutter at #365DaysOfAstro
What are the accomplishments of black astronomers and physicists? Why does diversity remain so low in higher education, especially physics? What can we do to prevent bias and discrimination? I discuss these questions and more in today’s Ask a Spaceman!
Are there more than four forces of nature? Is dark matter connected to dark energy? What the heck are dark photons? I discuss these questions and more in today’s Ask a Spaceman!