A term used by astronomers to describe all elements except hydrogen and helium, as in "the universe is composed of hydrogen, helium and traces of metals". This astronomical definition is quite different from the traditional chemistry definition of a metal.
Mars Express achieves 25,000 orbits
Mars Express achieves 25,000 orbits by Erica Marchand Paris, France (SPX) Mar 28, 2024 Celebrating a significant milestone, ESA's Mars...