The gravitational wave background that Miles refers to was created by merging supermassive black holes in the early and distant universe. It was first revealed by a gravitational wave detector ...

Surprise Anomaly In Gravitational Wave Background Hints At Supermassive Black Hole Collision A galaxy-sized observatory has produced the most detailed map of gravitational waves to date.

To understand where black falls on the color spectrum, first consider what light actually is. Light is radiation visible to the human eye Light is energy called electromagnetic radiation.