Ten years ago, scientists heard the universe rumble for the first time. That first discovery of gravitational waves proved a key prediction from Albert Einstein's theory of general relativity and began a new era of astronomy.

Now, a new gravitational-wave discovery marks the anniversary of this major breakthrough. Published today in , it puts to the test a theory from another giant of science, Stephen Hawking .

What are gravitational waves?

Gravitational waves are "ripples" in the fabric of space-time that travel at the speed of light. They are caused by highly accelerated massive objects, such as colliding black holes or the mergers of massive star remains known as neutron stars.

Wild New Theory Suggests Gravitational Waves Shaped The Universe

These ripples propagating thr

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