The craziest experiment ever built. Out in the desert, far from any city, stand two massive concrete tunnels.
They don’t look like much, but together, they form one of the most precise machines humans have ever built.
Each tunnel is 4 kilometers long. Inside them runs a long metal pipe, almost empty of air. At the ends sit some of the smoothest mirrors ever made, polished at the atomic level.
Scientists fire a powerful laser into the system. The beam is split into two and sent down each tunnel. It bounces back and forth between the mirrors again and again, building up strength. Then the two beams are brought back together and compared.
What are they looking for?
Tiny changes, smaller than an atom, that show space itself is stretching and squeezing.
A hundred years ago, scientists believed this effect could never be detected. It was thought to be far too small, far too subtle.
But after decades of work, hundreds of scientists, and more than a billion dollars, they finally found it: ripples in space-time itself, caused by violent events like black holes colliding.
And now…
The signals they’re detecting today are pushing the limits of this machine. There’s so much more to hear, fainter ripples, earlier echoes from the universe, that scientists are already planning something even bigger, even more sensitive. A new machine… to listen deeper into the universe than ever before.
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