A region of the Andromeda galaxy, as imaged by Hubble’s Panchromatic Hubble Andromeda Treasury, along with the unusual, X-ray emitting object J0045+41, now known to be an ultra-distant binary supermassive black hole. Image credit: NASA/CXC/University of Washington/ESA.

The Largest Black Hole Merger Of All-Time Is Coming, And Soon

Sometimes, you look in a nearby galaxy, and what you find beyond it will change everything.

Ethan Siegel
Dec 11, 2017 · 3 min read

Einstein’s theory of General Relativity has withstood every test for more than a century.