A few questions&#x2F;comments:<p>* What is the &quot;4 billion years ago impact&quot; that is refered in the video? At first I thought it was the Theia impact, but the sizes and speeds don&#x27;t quite match, and the simulation doesn&#x27;t result in a second moon.<p>* It also mentions that it has happened 6 times. The only impact large enough I can remember of the top of my head that sort of matches that scale would be the canadian impact basin. A quick search on wikipedia tossed me to this list [0] but everything there seems to be on a different scale than what&#x27;s described in the video. Are those impacts mentioned in the full program?<p>* It was recently reported that an expedition drilling in a part of the ocean where the crust is thin had found microbes near the magma, but I can&#x27;t find any link. Given that it has been theorized even Venus may hold life in it&#x27;s upper atmosphere [1], my guess would bethat, life is far more resilient than we imagine it to be.<p>[0] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;List_of_impact_craters_on_Earth" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;List_of_impact_craters_on_Eart...</a><p>[1] <a href="http:&#x2F;&#x2F;web.archive.org&#x2F;web&#x2F;20110807004311&#x2F;http:&#x2F;&#x2F;gltrs.grc.nasa.gov&#x2F;reports&#x2F;2003&#x2F;TM-2003-212310.pdf" rel="nofollow">http:&#x2F;&#x2F;web.archive.org&#x2F;web&#x2F;20110807004311&#x2F;http:&#x2F;&#x2F;gltrs.grc.n...</a>