[Q&A] Hiding Earth from Aliens, Truth About Pyramids, Crashing Into a Black Hole

Can we make Earth invisible for possible alien invaders? What's the deal with the pyramids and their alignment to stars? Can an interstellar ship casually crash into a black hole? And what's the difference between cosmology and astronomy after all?

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00:00 Start
00:27 [Rod Tolosa] Possible life on Venus
03:16 [abstractedaway] Heium-rich dwarf stars as techosignatures
04:00 [kenji] The truth about pyramids
06:25 [Jakub Polášek] Most interesting citizen science projects in astronomy/space field right now
07:21 [Osiris Mpg] Could an interstellar ship crash into a black hole?
08:34 [FunkyCritter] Will Earth's spin stop eventually?
09:12 [Keiichi S] Naked-eye nebula
11:03 [Nolan Mosley] LEO satellites and the ozone layer
13:11 [Nanp90] Making the Earth invisible for alienes

📺 VIDEO VERSION
https://youtu.be/cuXXPrp3_PU

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