Space junk returning to Earth is introducing metal pollution to the pristine upper atmosphere as it burns up on re-entry, a new study has found.

Human crews headed for Mars are still looking at journeys that last most of a year, long enough for radiation, boredom and mechanical risk to pile up. Nuclear propulsion promises to compress that ...

Scientists detect a lithium plume 100km above Earth and trace it to a returning SpaceX Falcon 9 rocket stage, raising new questions about atmospheric pollution.

Scientists studied the chemical trails, cosmic junk signatures and this lithium plume to study the trajectory of ...