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Cosmic Recipe: 25 Deuterium AtomsThe universe contains exactly 25 deuterium atoms per million hydrogen atoms - a ratio set in the Big Bang's first three minutes. This "cosmic deuterium" is our most precise test of Big Bang physics, and so far, the theory passes.
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The Asteroid Gaps Jupiter Can't ExplainThe Kirkwood gaps are regions with few asteroids due to Jupiter's resonance. But some gaps persist where no resonance exists.
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