A new paper suggests that pollution from falling space junk could irreversibly alter our planet's magnetic field. But not everyone is convinced. (Image credit: PaulFleet via Getty Images) "Spacecraft dust" from defunct satellites burning up in Earth's atmosphere could weaken our planet's magnetic field, a controversial new paper suggests. In the worst-case scenario, the unchecked expansion of commercial satellite "megaconstellations" orbiting Earth, such as SpaceX's Starlink network, may generat...