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submitted 4 months ago by murmelade@lemmy.ml to c/askscience@lemmy.world

Let's say the roofs are all red, how big does it have to be to be visible as a little red dot?

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[-] MalReynolds@slrpnk.net 14 points 4 months ago

Depends on how bright the lights are, and the phase.

[-] winterayars@sh.itjust.works 3 points 4 months ago

Cool idea for an SOS beacon: Just shoot an incredibly bright red light at Earth and they'll know something bad is happening :D

[-] pennomi@lemmy.world 13 points 4 months ago

If you can shoot an incredibly bright red light, chances are you can shoot an incredibly bright radio light too.

this post was submitted on 17 Jul 2024
109 points (100.0% liked)

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