A SpaceX Falcon 9 crashed to Earth last year. Now scientists have measured the pollution it caused.

Direct detection of lithium from a SpaceX rocket reentry offers new evidence that metal pollution from space debris could ...

When part of a SpaceX rocket re-entered Earth's atmosphere exactly a year ago, it created a spectacuglar fireball that ...

Rocket launches face hidden challenges from cryogenic fuel leaks. Storing super-cold fuels like liquid hydrogen and oxygen at extreme temperatures creates engineering hurdles. Materials shrink, ...

This puzzle is known as the problem of time, and it remains one of the most persistent obstacles to a unified theory of physics. Despite enormous progress in cosmology and particle physics, we still ...