So theres a spaceship 5 light years away from earth and they want to send a signal to earth but a cloud of interestellar dust dont let them use light or radio signals so they decide to send a gravity signal. So they produce a violent huge thermonuclear explosion that will send some particles CLOSE to lightspeed. Then the mass of those particles increase hugely due to relativity and hence its gravitational field. And this gravitational field would be detected as a perturbation of the force of gravity from earth. Would this be correct?