The fastest man-made thing moving from earth towards outer space is radio waves, which are as fast as light (in a vacuum), and we have surveyed the skies for more than 100 years now. So, if they were to exist anywhere in the radius of 100 light-years (9.4607304725808 x 10^14 km-an incredibly unfathomably huge distance) we would have heard from them by now. Hence it will take much more than a few centuries for such species to find our twin telescoped.
Submitted September 14, 2022 at 09:59AM by ElectricalSoft4154 https://ift.tt/4AfesXK
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