Burnt-up satellites could dump hundreds of tonnes of aluminium in the stratosphere every year. An atmospheric chemist explains what that might mean

Earth’s orbits are getting more and more crowded. To keep track of everything and avoid collisions and catastrophes, we need a new field: space domain awareness.

A mysterious hunk of space junk buzzed through Australian skies last night. It may have been the third stage of a Soyuz 2 rocket just launched by Russia.