Space Waves Direct

In 2015, the Laser Interferometer Gravitational-Wave Observatory (LIGO) made history by detecting a whisper from 1.3 billion years ago: the final death spiral of two black holes, each about 30 times the mass of our Sun. As they merged, they released more energy in gravitational waves than all the stars in the observable universe emit in light. And yet, by the time that wave reached Earth, it had faded to a ripple that stretched and compressed the entire planet by less than the width of a proton.

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For the first time, we saw a cosmic event with both our "eyes" (light) and our "ears" (gravity). The data was so rich that it confirmed the origin of most heavy elements—gold, platinum, uranium—in the universe. We had watched a kilonova forge gold in real time. Would you like to know more about a