# Zwicky's Dark Matter: The Universe's Greatest Hidden Mystery
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# Zwicky's Dark Matter: The Universe's Greatest Hidden Mystery
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概要
Good evening, stargazers! Welcome back to another episode of Astronomy Tonight, where we explore the cosmos and celebrate the celestial events that have shaped our understanding of the universe.
Today, we're highlighting a remarkable event that occurred on **January 30th, 1933**—nearly a century ago—when **Fritz Zwicky made his groundbreaking announcement about "dark matter."**
Now, here's where it gets fascinating: Zwicky, a Swiss astronomer working at Caltech, was studying the Coma Cluster—a collection of about 1,000 galaxies bound together by gravity. When he calculated how fast these galaxies were moving and compared it to the cluster's visible mass, something didn't add up. The math was telling him something extraordinary: there had to be roughly **400 times more mass** holding this cosmic dance together than what astronomers could actually *see*.
Imagine throwing a party and watching your guests move around so energetically that their speed suggests there should be 400 times more people in the room than you can actually count! That's essentially what Zwicky observed.
He boldly proposed the existence of what he called "dark matter"—invisible material that accounts for the missing gravitational mass. For decades, his idea was largely dismissed as eccentric. But here's the beautiful part: he was *right*. Modern astronomers now know that dark matter comprises roughly 85% of all the matter in the universe! Zwicky was peering beyond the veil of visible light into the fundamental architecture of the cosmos itself.
What an incredible reminder that sometimes the most profound discoveries come from noticing what we *can't* see.
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