Showstopper for Mars Missions, Vera Rubin vs Aliens, Space Whales | Q&A 351

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Which is a bigger showstopper for a human Mars mission: food or radiation exposure? Does Vera Rubin leave any chance for aliens to still sneak upon us? Can something like space whales actually exist? And in Q&A+, when can we find out what dark matter and dark energy actually are?

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?

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