It's not very practical. We've been able to detect gravitational waves from blac... | Hacker News

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		elihu on June 11, 2021 \| parent \| context \| favorite \| on: Physicists measure the gravitational force between... It's not very practical. We've been able to detect gravitational waves from black holes (or maybe neutron stars? Something like that anyways...) falling into each other, so in theory we could send a message across the galaxy using non-electromagnetic means if we could deliberately cause a similar event. I'm not sure why we'd want to even if we could, though I guess "hey look at this, I can push a black hole into another one" would likely be regarded as a rather meaningful kind of message on its own to anyone with the technology to hear it.

TheOtherHobbes on June 11, 2021 [–]

It's not much of a message unless you can push multiple black holes into each other in a carefully timed sequence.

If you can do that, a lot of other civs are going to give you a wide berth. And some of the rest may consider you a problem.

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