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I believe you misinterpret the article. Physicists on earth are using small timing fluctuations in the radiation arriving from multiple far-flung pulsars to try and detect gravitational waves. This is what is meant by a galaxy-sized gravitational wave detector.

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It was a joke.

Yes, it was. And that is a reason to downvote.

People aren't on Hacker News for the jokes, and a significant fraction don't like seeing threads hijacked by silliness. We've all seen Reddit, and are choosing not to be there for a reason.

That's not to say that you can't get away with jokes here. But the bar for them to work is very high.

You are correct, and this is important. The flood of 2020 newcomers have not acculturated, creating frequent misapprehensions.

We are not amused.

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