Megaconstellations of satellites are ruining the night sky for everyone

Abstract:
	Several companies are now launching megaconstellations of thousands
of communication satellites (satcons), which would increase the number of
active satellites in Low Earth Orbit at least twenty-fold in the next few
years.	SpaceX's Starlink satcon is currently largest (over 3,100
satellites) and is adding 60 new satellites every couple of weeks. While
these satcons do allow internet access in many underserved rural and remote
locations, the costs are prohibitively high for all but the most well-off
customers.  These thousands of satellites each reflect sunlight, causing
serious problems for research astronomy, and making anthropogenic light
pollution a fully global phenomenon that cannot be escaped anywhere on
Earth.	Our recent simulations show that because of geometry and the chosen
satellite orbits, latitudes near 50 degrees N and S will see the worst
light pollution from these satcons, with hundreds of naked-eye visible
satellites all night long in the summer. These satellites also contribute
to significant atmospheric pollution, both on launch and re-entry,
contribute to diffuse sky emission, and drastically increase the very real
threat of Kessler Syndrome.  I will talk about how these satellites will
affect stargazers and astronomers worldwide, and what you can do to help
mitigation efforts.

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Recordings available at: https://www.youtube.com/watch?v=BIFu3mbxqiw&list=PLupSU3PE5is1fkio36JA9DaYHyTJ9X6Jt