A new analysis of isotopic signatures across planets and meteorite parent bodies suggests our home world formed entirely from inner solar system material, challenging long-standing theories of distant origins. An artist’s impression of the asteroid 2025 MN45. Image credit: NSF-DOE Vera C. Rubin Observatory / NOIRLab / SLAC / AURA / P. Marenfeld. “Our calculations make it clear: the building material of the Earth originates from a single material...
