Geochemistry

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Lunar Regolith Study Limits Meteorites’ Contribution to Earth’s Oceans

Triple oxygen-isotope fingerprints in Apollo soil set hard limits on post–Late Heavy Bombardment water delivery.

NASA Study of Apollo Moon Soil Finds Meteorites Supplied Only a Small Share of Earth’s Water

Helium-3 Dating Reveals Rapid Post-Impact Evolution in Ocean Plankton

Pompeii Baths Went From Foul Wells to Cleaner Aqueducts, With Lead Risks

Lab Experiments Reveal Planets Can Make Water From Hydrogen–Magma Reactions

PNAS Study Finds Rare Water-Rich Meteorite Relics in Chang'e-6 Far-Side Samples

Ancient Mantle Rocks Reveal Potassium-40 Deficit Linked to Surviving Proto‑Earth

First Detection of Heavy Water in a Planet-Forming Disk Points to Prestellar Origins

Study Pinpoints a Dry Proto‑Earth Within 3 Million Years, Bolstering Theia Water‑Delivery Theory

Australian 'Ananguites' Point to a Giant 11-Million-Year-Old Impact With No Known Crater

Ice Shown to Dissolve Iron Faster Than Liquid Water in New Lab Study

New 'Ananguite' Tektite Field Identified in Australia From 11-Million-Year-Old Impact

Study Pinpoints Microbial Colonization of Finland’s Lappajärvi Impact Crater

UC Santa Cruz Model Recasts Sub‑Neptune ‘Steam Worlds’ With Colder, Smaller Interiors

Deep-Sea Cores Uncover Possible Cometary Debris at Younger Dryas Onset