This simulation shows the radiation emitted from a binary black hole system. Although we’ve detected many pairs of black holes through gravitational waves, they’re all restricted to black holes of ~200 solar masses or below, and to black holes that formed from matter. The supermassive ones remain out of reach until a longer baseline gravitational wave detector is established, while pulsar timing arrays are capable of picking up even longer-wavelength and more exotic signals. (Credit: NASA’s Goddard Space Flight Center)

Why gravitational waves are the future of astronomy

It was over 100 years ago that Einstein put forth, in its final form, the General theory of Relativity. The old Newtonian conception of gravitation — where two massive objects attracted…

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Ethan Siegel

The Universe is: Expanding, cooling, and dark. It starts with a bang! #Cosmology Science writer, astrophysicist, science communicator & NASA columnist.