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中子星碰撞表明引力波会以光的速度传播:等效性原理
Gravitational waves, the kind of spacetime distortions created by the neutron star collision, were first predicted by Einstein in 1915 and first detected at LIGO 100 years later. Central to Einstein’s picture of gravity is the idea that everything with mass warps the ‘fabric’ of space, so every planet, star or galaxy creates a kind of dent. When massive objects orbit each other they create ripples in this fabric: gravitational waves. Einstein predicted these waves would travel at the speed of light. We already had evidence of this but the neutron star explosion was a direct confirmation, since the gravitational signal and the light travelled 130 million years and arrived at virtually the same time.
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