Fossilized space dust from 2.7 billion years ago holds surprise about Earth's ancient atmosphere
Wednesday, May 11, 2016 - 12:31
in Astronomy & Space
Each year, more than 3,000 tons of space dust fails to burn up in our planet's atmosphere and falls instead to Earth's surface. These micrometeorites are just a few microns in diameter, but scientists say that embedded in the fossilized specks of this extraterrestrial debris are chemical clues...