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

    • winterayars@sh.itjust.works
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      2 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
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        2 months ago

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