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Do gravitational waves leave a mark on the Universe?

Daniel and Kelly’s Extraordinary Universe

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How Long Does It Take Light to Get Through?

When we talk about spatial curvature, we don't mean curvature with respect to some external ruler. Our bending of space that we talk about is intrinsic. It's just a changing of relative distances between things. And that's exactly what we're measuring by sending a beam of light through and saying, oh, how long does it take light to get through or measure that relative distance? Well, it's super tricky but humans and namely engineers have done it. They measured gravitational waves that come from these crazy events out there in the universe,. like two black holes circling each other in a death spiral.

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