[Q&A] Showstopper for Mars Missions, Vera Rubin vs Aliens, Space Whales

00:00 Start

00:31 [Kasie Ream] Which is the bigger showstopper for Mars: food or radiation?

02:29 [Richard Vanasse] Does Vera Rubin make it impossible for an alien fleet to sneak up on Earth?

02:54 [ventsyv] One question to ask aliens

03:24 [Terminally Offline] How can I get into a career in a planetarium?

05:56 [Steve Kennedy] What is the difference between a Kilonova and a Type 1a Supernova?

06:12 [teknophyle] Should we quickly become a two planet species?

08:14 [Michael D] How do I feel about the possibility of "space whales" type aliens?

09:51 [Bobby 2112] How does artificial gravity work on various scifi spaceships?

12:34 [shootZ234] Interesting facts about black holes

12:55 [paul wilson] How bright will the Betelgeuse explosion be?