[Q&A+] Approaching Rogue Black Holes, Moon VS Mars, Other Oort Clouds

BONUS QUESTION STARTS AT 13:54 Watch the video here (with no ads) or on YouTube: https://youtu.be/JHFXyJmaHbw 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10:46 [@EdSceptic-y2e] Why can't we see other stars' Oort clouds? 11:32 [@evandotpro] Is our view of other galaxies outdated? 12:56 [@Mark-Mattison] How does cosmological redshift work? 13:54 [@prugrade] Can they make it rain on Mars?