My Favourite Space Image, Shape of Oort Cloud, The Concept of Aliens | Q&A 323

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When did humans first think of aliens? Why is Oort cloud a sphere when the Solar System is a disk? Which space image is my favourite? And in our Q&A+ on patreon, is search for life only limited to looking for water? Answering all these questions and more in this Q&A show.

00:00 Start
00:30 [Paige Potter] When did humans first think of aliens?
03:24 [Paul_in_Tucson] Why is Oort cloud a sphere while Solar System is a disk?
06:51 [Walter Hartman] Are dark matter and dark energy 100% real?
11:33 [Scotty-Too-Hottie] How long before our Sun turns into a red giant?
13:34 [Heya Sasha] My favourite space image

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