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Cake day: July 1st, 2023

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  • Do we actually know how to build a self-sustaining colony? Last I heard, we still had fundamental science and engineering questions to be solved even if we suddenly had an unlimited budget.

    Things that come to mind include building a sustainable closed ecosystem, figuring out a long-term power source (is there uranium on Mars? Nuclear reactors run for a long time, but we can’t rely on fresh fuel rods being shipped from Earth), and planning for enough industrial base that things like mining the necessary uranium, digging tunnels, housing construction, etc aren’t colony-ending problems.












  • Yeah, that’s a fair point about using a larger meteor. Unless the alien assigned to the task screwed up? Unlikely, yes, but that’s the problem with this kind of speculation. There isn’t really any evidence to examine. Maybe there weren’t any aliens. Maybe there were, and they screwed up! Maybe there were, and they thought what they used would be enough, but a quirk of Earth biology let small mammals survive. Maybe there were two groups of aliens, and the second group interfered enough to prevent full overkill.

    Alien shepherds could def be Option 6. These could all be fun sci-fi story prompts!





  • I did some looking and found this question on Stackexchange. The diagram was super helpful for me – it’s pretty intuitive to see where the mission is going.

    Also, thanks for posting that article! It had a reference to http://www.collectspace.com/news/news-112622a-artemis-i-breaks-apollo-13-distance-earth-record.html which cited the actual records (talking about Artemis I, not II):

    The uncrewed Orion flew past the record-setting distance achieved by the Apollo 13 command module “Odyssey” at 248,655 miles from Earth (216,075 nautical miles or 400,171 kilometers) at about 8:40 a.m. EST (1340 GMT) on Saturday (Nov. 26).

    The Apollo 13 spacecraft had previously set the record on April 14, 1970, at 7:21 p.m. EST (0021 GMT on April 15).

    NASA expects the Artemis I capsule to reach a maximum distance from Earth of 268,553 miles (432,194 km) at 4:06 p.m. EST (2106 GMT) on Monday (Nov. 28).

    So they’re actually going 32,000km past the previous record. It’s interesting that they’re using such a far-flung lunar orbit.


  • A smidge is right. It sounds like they’re going 10,000km away from the far side of the Moon. To compare, the Moon’s average distance is 385,000km, so they’ll actually be 395,000km away?

    Except that’s probably off by a few thousand km; the 385,000 figure is the average distance from the center of the Earth to the center of the Moon. Meh, correcting for center vs. radius is starting to sound like homework, so this will have to be “close enough for a Lemmy comment” :)

    Edit: OP posted another article in a comment; Artemis II will actually be 432,194km away. Sounds like “a smidge” is about 10% of the distance in this case!