In our Milky Way galaxy, if .01% of the about 300 billion (300,000,000,000) (not dwarf) stars naturally achieve what can eventually evolve technologically advancing aliens, then for our galaxy main disk these might give distinctive advancing aliens in an 85 average light years radius sphere, thus not likely at any of the 207 nearby stars only 49 light years from Sol. But this was ok with Earth astronomers. They weren't searching for advanced aliens. But the settlers did suggest that they could have elaborate robotic analyzing surface probing devices formed which could be sent to land on planets found to have useful temperatures and surface water which could maybe help simple life spontaneously form and somewhat evolve to adequately perpetuate. It would be most interesting to discover some natural formed simple life, even if merely single celled. Some Earth astronomers found that agreeably interesting.
Thus some such high orbiting settlers began having formed from usable asteroids some telescopes to be sent to the 207 nearby stars at most 49 light years from Sol. These would be sent to such stars by ion jets, accelerating them to a fraction of light speed, like maybe 1/5. Energy for this could come from matter and antimatter reactors, (the antimatter formed from collected Solar light energy). It could thus need up to 2.5 centuries to get these jetted from here to reach such neaby stars. Then each would need up to a half century to aim back to us collected images and planetary and big asteroid orbit data.
To receive back here such images and sent planetary data, a collection of well aimed robotically formed communications telescopes would be stabilized at our L4 & L5 Lagrangian points which lie 60deg ahead of and behind Earth in its orbit. Their aiming directions would be refined to different stars at different special times of day.
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