Approaching Rogue Black Holes, Moon VS Mars, Other Oort Clouds | Q&A 399

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Could we spot a black hole approaching us? Is the Moon just a distraction on the way to Mars? Why don't we see other stars' Oort clouds? And in Q&A+, can the make it rain on Mars?

00:00 Start
00:23 [@keithromig] Is the Moon a distraction from Mars?
04:10 [@vistotutti6037] Should we put a steam engine on the Moon?
06:25 [@ashd.007] What if a rogue black hole comes our way?
08:26 [@mrjp2149] A better description for a black hole
09:42 [@allixandra] Is the asteroid belt a failed planet?
10:46 [@EdSceptic-y2e] Why can't we see other stars' Oort clouds?
11:32 [@evandotpro] Is our view of other galaxies outdated?
12:56 [@Mark-Mattison] How does cosmological redshift work?

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