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We could find advanced aliens by looking for their space junk | New Scientist Mar 2018
"Technologically advanced aliens could be revealed by the space junk around their planets."

"Many satellites work best in geosynchronous orbits, where the satellite matches the planet’s rotation so it stays over the same general location on the surface. This is key for surveillance and telecommunications satellites. These orbits are all at about the same altitude – on Earth, around 35,800 kilometres up. So, geosynchronous satellites form a ring around the planet, known as the Clarke belt.

Socas-Navarro calculated that the opacity of Earth’s Clarke belt has increased exponentially over the past 15 years. He found that if this trend continues, it will be observable from nearby alien worlds around the year 2200."
orbital-debris  space-debris  space-junk  NewScientist  GEO 
september 2018 by pierredv
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