Fossilized micrometeorites record ancient carbon dioxide levels A cadre of iron-rich extraterrestrial particles picked up faint whiffs of our planet's atmosphere when they fell to Earth millions of years ago. Astrobitica September 9, 2025 (Last updated: September 9, 2025) 1 minute read A cadre of iron-rich extraterrestrial particles picked up faint whiffs of our planet’s atmosphere when they fell to Earth millions of years ago. About the Author Astrobitica Administrator Visit Website View All Posts Post navigation Previous: SpaceX’s lesson from last Starship flight? “We need to seal the tiles.”Next: Maxar to supply 3D terrain data for U.S. Army mixed-reality system