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This web page states the following, "LISTENING TO THE DARK SIDE OF THE UNIVERSE." We saw that the web page also stated " AN AUDIO GUIDE TO UNDERSTANDING GRAVITATIONAL-WAVE SIGNALS." It also said " Our purpose is to explore the physics of gravitational waves via an analogy to audible sounds. Gravitational waves GW are ripples in the fabric of spacetime produced by colliding black holes, neutron stars, supernovae, and other astrophysical phenomena. There is a worldwide effort to detect these waves using giant laser interferometers like LIGO." The header had gravitational waves as the highest ranking optimized keyword. It is followed by sounds, black holes, and LIGO which isn't as ranked as highly as gravitational waves.