gravitational wave
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A gravitational wave is a ripple that travels through space itself, caused by the motion of massive objects like colliding black holes or neutron stars. These waves matter because they let us observe cosmic events we couldn't see before and provide a completely new way to study the universe.
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Article
As two black holes orbit closer to one another, they emit gravitational waves, the frequency of which increases to a peak as the black holes coalesce.
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