Anonymous Coward writes:
https://www.businessinsider.com/alien-civilizations-may-have-already-colonized-galaxy-study-2019-8
The Milky Way could be teeming with interstellar alien civilizations — we just don't know about it because they haven't paid us a visit in 10 million years.
A study published last month in The Astronomical Journal[$] posits that intelligent extraterrestrial life could be taking its time to explore the galaxy, harnessing star systems' movement to make star-hopping easier.
The work is a new response to a question known as the Fermi paradox, which asks why we haven't detected signs of extraterrestrial intelligence.
(Score: 3, Insightful) by Immerman on Tuesday September 10 2019, @01:35PM
Actually though, it's not nearly that odd - at present if Earth had a twin civilization orbitting the nearest star, it's doubtful that we'd be able to detect them - their radio emissions would be lost in the much louder radio noise from the star itself.
With current technology we'd really only be able to detect intentional interstellar radio communications directed directly at us, or that we happened to be almost perfectly in line with. (since tight-as-possible-beam communications would almost certainly be the rule due to power requirements) Or alternately, insanely high-power "beacons" designed specifically to draw the attention of young civilizations.