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43: Gravitational Waves, The Loneliest Animal, and Graffiti

Let's Learn Everything!

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The International Pulsar Timing Array

Gravitational waves change the distance between objects. As a gravitational wave contracts or expands the fabric of space time, the light from a pulsar will either arrive a little bit early or a little bit late to Earth. So by having an array of pulsars just distributed across the sky, you can look for patterns between pulsars to detect low frequency gravitational waves. The frequencies of the waves that LIGO was detecting about 10 to 100 hertz are in nanohertz. A hundred billion times lower than the human audible range.

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