The upper-stage helium tank of the Ariane 3 that was launched in 1985 was recovered in Uganda in 2002 after re-entry. Molten aluminum splashes were discovered on the tank, which have been identified ...

A recent Physical Review Letters study presents a new model for quark star merger ejecta that could resolve whether these cosmic collisions generate ordinary matter or something different. The ...

Astronomers have long studied meteorites that have clearly come from the Moon and Mars. These are the result of massive asteroid impacts which eject material with such force that it ends up in ...

A growing number of active or derelict satellites is not the only threat to the lunar orbital environment. According to Newton (still mostly correct) rocket engines, designed to push a spacecraft up ...