The newly faint readings show the "ringing" waves produced at the very end of the merger of two black holes. These larger waves were previously obscuring the more subtle waves given off for just milliseconds, after they merge. Einstein's theories predict that black holes should be "fundamentally simple" objects that can be described mathematically by nothing more than their mass and their spin. These readings, looking at the two "before" black holes and the single "after" black hole, observationally confirm this prediction for the very first time. According to Hawking's area theorem, a black hole's area should only be able to increase due to classical processes—the collision of two black holes being a perfect example.