SciencefromNature2 weeks agoAncient 'snowball' Earth had frigidly briny seasSnowball Earth oceans were extremely cold (around −15 °C) and so highly saline that seawater remained liquid at subfreezing temperatures.
Sciencefromwww.scientificamerican.com2 months agoLost Planet Theia that Created the Moon Came From the Inner Solar SystemTheia formed near Earth and contributed iron and molybdenum to Earth's mantle, explaining the Moon and Earth’s near-identical isotopic compositions.