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Most of the universe may be invisible: dark matter emits no light, yet gives itself away through gravity. Galaxy rotation and lensing hint at an unseen ‘skeleton.’
When you look at the night sky, it feels like you’re seeing the universe—but what you see may be only the display case. Much of the mass could be hidden in something that doesn’t shine.\n\nDark matter isn’t visible because it doesn’t emit light. Yet its gravity makes it readable: it shapes how stars and galaxies move, and even how light bends through space.\n\nSurprising detail: the unseen component can act like a skeleton around galaxies. Visible stars may rotate faster or stay bound as if hung on an invisible framework.\n\nIt matters because science relies not only on what it sees, but on what it measures. We may not see dark matter, but the universe’s behavior can offer strong clues that it’s there.
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