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Weekly: New era in gravitational astronomy; Upending stereotypes of women in hunter-gatherer societies; Orangutan beatboxing and human speech origins

The world, the universe and us

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The Different Types of Gravitational Waves

LIGO detectors are looking at what's much more long, slower waves from very large collisions. The scale of the detector here is so large that you can't make it on Earth. You actually need something that is of the order of the distance across our galaxy. It just so happens that we have the perfect astrophysical object that we can use for these detectors. They are called pulsars, a neutron star to be exact. That is highly magnetized and it is rotating at hundreds of times a second. And every time it rotates, it sends out a pulse of light. So if there is a background gravitational wave, then it will be affecting the timing in the exact same way

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