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- Updates 7 hours ago
RT @NASAExoplanets: A collision of two massive galaxy clusters provided the first direct proof of dark matter, the mysterious substance that makes up most of the universe. It was captured by ground observatories and @NASAHubble (blue) & @chandraxray (pink). More: https://t.co/uVZbIzm0qL https://t.co/o0Tn4m7wm7
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