Getting Stuck on a Planet, Dangerous Supernovae, Expansionistic Aliens | Q&A 327

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How big does a planet has to be to make it impossible to fly a rocket from it? Why are aliens always portrayed expansionistic? Can a supernova make us all go extinct? And in our extended Q&A+ edition, is terraforming Mars necessary for finding life there? Answering all these questions and more in this Q&A show.

00:00 Start
00:30 [knallpistol] How can stars in globular clusters be so close yet so far?
03:28 [Mister Ikkus] Why everyone imagines aliens to be expansionistic?
05:28 [Matthew Reuter] What's the limit on a planet's mass to get stuck on one?
07:51 [James Valley] Can a supernovae take us out?
08:50 [Paige Potter] When we colonize other places, will Earth become a concept rather than a place?
10:50 [Vicente Hdez] What have been the keys to staying constantly active in astronomy communication?
14:56 [Pete Harris] What to see in the Southern Hemisphere's night sky?

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