How Do We Know Black Holes Spin? [Video]

There are many mysteries in our wondrous galaxy. Black holes fascinate many of us and stir our imaginations. They’ve even been the subject of cheesy family movies.

While there is much we do not know about these monstrous star-eaters, there are characteristics we can observe and measure.

In this video, Derek Muller explains how scientists determine the spin of a black hole.