Experimental proof for Zeeman spin-orbit coupling in antiferromagnetics

Elon Musk's SpaceX is close to winning FCC approval to fly more than 4,000 Starlink satellites in a lower orbit. But rivals say it could increase collision risks.

Satellite skyglow may mean light pollution is unavoidable. Even when satellites and other objects in orbit are too dim to be resolved by the naked eye, they collectively scatter enough light back into the atmosphere that it produces a diffuse glow similar to light pollution from cities.

China launches experimental satellite into polar orbit