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This is a normal post Pointing at Earth will be tricky to say the least!
I notice it also assumes improvements in detectors, which reminds me of something Carl Sagan once said about radio telescopes. Apparently if you summed up all the energy picked up by all the world’s radio telescopes it would amount to about the same as a single falling snowflake.

Let’s just build a few self-sustaining habitats, strap a few fusion rockets to them and fling 'em into the void eh?
(, Thu 10 Nov 2022, 21:12, Reply)