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Aliens Communicate With Gravitational Waves
Any force that can compactify matter to produce a great enough energy density can form a singularity. It would not likely be gravity, it's the weakest force. You're more likely to use something like the technologies that we're developing for fusion,. So I don't know, the large ignition facility recently blasted a pellet with a hundred really bright lasers and caused that to get dense enough to engage in nuclear fusion.