- Ancient, primordial helium (Helium-3), a rare isotope of helium gas that was forged in the wake of the Big Bang , is leaking out of Earth’s core. Because almost all helium-3 is from the Big Bang, the gas leak adds evidence that Earth formed inside a solar nebula, which has long been debated. https://news.agu.org/press-release/ancient-helium-leaking-from-core-offers-clues-of-earths-formation 57 comments science
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