Chemical Fingerprint Found From 4.5-Billion-Year-Old Proto-Earth Ancient Origins Geologists discover the first evidence of 4.5-billion-year-old “proto Earth” MIT News Potassium-40 isotopic evidence for an extant pre-giant-impact component of Earth’s mantle Nature “They Found Earth’s Missing Piece”: This MIT Discovery Reveals Traces of the Original Planet Still Hidden Beneath Our Feet (and It’s Shocking) Rude Baguette 4.5 billion-year-old proto-Earth fragments found in Earth’s mantle The Brighter …
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