Two black holes, the most powerful forces in the universe, collide and emit gravitational waves.

Hollywood would have them crash together with the most thunderous sound ever heard.

But the actual sound of the gravitational wave: Bloop.

A simple, elegant, pure, even beautiful, bloop. Like a pebble dropping into a deep deep well, Which in an astrophysical sense it is.

In fact, it was so elegant I laughed.

The most powerful sound in the universe:

Bloop.