Black holes are some of the densest objects
in the universe, so we should be able to hear
and measure the waves created when they collide.
LIGO, the Laser Interferometry Gravitational
Wave Observatory listens for waves that can
come from over a billion light years away.
In 2017, LIGO heard an enormous crash.
Two very massive objects collided at near
the speed of light, in one of the most energetic
events that we've ever witnessed in the history
of humankind.
Two ultra-heavy, ultra-dense objects roll
around each other, hurling powerful gravitational
waves through space.
The closer the fall towards each other, the
more gravitational energy they throw out.
Finally, they collide in one of the most violent
events in the universe.
This smash sends out immense gravitational
waves that ripple across intergalactic space.
Until eventually LIGO detects them.
