An arXiv preprint suggests that evidence of intelligent (or trashy) life could be found by looking for space junk:
Its author, Héctor Socas-Navarro, spends most of his time at the Canary Islands Institute of Astrophysics in Spain studying the sun. But he was struck by a weird side effect of the ring of active and retired satellites circling Earth: it's a little bit opaque. And the more satellites we throw up there, the more opaque it gets. He realized that if we—or any technologically advanced aliens out there—build enough satellites, they'll eventually become dense enough to leave a faint shadow around the planet when it passes in front of a star.
And that's awfully convenient given that one of the best ways we have of spotting alien planets is by staring at their stars and waiting for tiny dips in brightness as planets pass in front of them. Essentially, Socas-Navarro's new paper proposes, if aliens have put enough satellites into orbit around their planet, we'll be able to spot the faintly opaque bubble before and after we spot the brightness dip of the planet itself.
The scale of the endeavor would be a real challenge for the aliens, however, since this idea relies on between 10 billion and one trillion satellites. "It's like building the pyramids," Avi Loeb, an astronomer at Harvard University, told New Scientist. "Each building block is easy, but putting it together is the hard engineering task."
(Score: 2, Insightful) by Anonymous Coward on Thursday March 08 2018, @11:23PM
They are going to look for space junk around exoplanets. Massive reality check on the pseudoscience being spouted here. There is a very interesting video on Youtube about Python being used in astronomy. https://youtu.be/lWl6d7mkru4 [youtu.be]
It is worth the time to watch the whole thing, but around the 4 minute mark he talks about exoplanets and how they are "seen" today. Maybe the future projects will see more, but those are still in the pipeline and not available today.
Spoiler alert: "exoplanet" is based on a small dip in brightness looking at a star that consists of 4 pixels. And they want to see space junk. Really?