this post was submitted on 06 Dec 2025
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Giant Mirrors in Space Could Bring Sunlight After Dark, One Startup Says—and Astronomers Are Concerned (www.smithsonianmag.com)
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[–] bufalo1973@piefed.social 1 points 3 months ago* (last edited 3 months ago)

If it's only to heat up the house you don't need to dig deep. IIRC, less than 5 m if the pipes are horizontal.

At least is what WP says