Nikhef - How can we detect gravitational waves?

Gravitational waves are like ripples in space caused by huge events in the universe, and we can catch them using really sensitive tools.

Imagine you're on a trampoline. When someone jumps on it, the surface bounces up and down, making ripples that spread out. That’s kind of what happens with gravitational waves, they’re like those ripples but in space itself.

At Nikhef, scientists use something called LIGO (and sometimes Virgo) to detect these waves. It's like having a super-sensitive trampoline that can feel the tiniest ripples from far away.

LIGO uses two long tunnels, each about 4 kilometers long. A laser beam travels back and forth in each tunnel. When a gravitational wave passes by, it stretches space, just a little bit, like squishing and stretching the trampoline, and that changes how the light moves.

The scientists watch for these tiny changes. It’s like watching a pendulum swing, if something makes it move just a little more or less, you know something happened.

Even though gravitational waves are super small, with really good tools, we can catch them, it's like hearing a whisper from across the galaxy!