this post was submitted on 06 Nov 2025
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Controversial startup's plan to 'sell sunlight' using giant mirrors in space would be 'catastrophic' and 'horrifying,' astronomers warn (www.livescience.com)
submitted 13 hours ago by themachinestops@lemmy.dbzer0.com to c/technology@lemmy.world
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https://archive.ph/3WZrp

California-based startup Reflect Orbital aims to build a swarm of 4,000 giant mirrors in low Earth orbit to "sell sunlight" to customers at night. Experts warn that the mirrors could mess with telescopes, blind stargazers and impact the environment.

Reflect Orbital, which was founded in 2021, has recently taken the first step in a scheme to sell sunlight at night by bouncing solar rays off giant "reflectors" that can redirect the vital resource almost anywhere on our planet. By doing this, the company aims to extend daylight hours in specific locations, thus allowing paying customers to generate solar power, grow crops and replace urban lighting.

But experts say it is a wildly impractical plan that should never get off the ground. What's more, the resulting light pollution could devastate ground-based astronomy, distract aircraft pilots and even blind stargazers.

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[–] humanspiral@lemmy.ca 5 points 8 hours ago

for solar, a 5km diameter solar farm might hold 10m square meters of panels. at 250w each, 2.5gw solar farm. 4 times a full moon, is 1/100000th the rated capacity (noon at equator) of panels, and so 25kw of power. At 10c/kwh electricity revenue potential, such a farm (exists only in China) could break even offering to rent night light at $2.50/hour.

Batteries charged by solar can deliver profitable electricity at night for far less than 10c/kwh.

If you just want more light somewhere, it would be far cheaper to do from ground systems.