We've Long Thought The Surface Area Of A Black Hole Can't Decrease. Now We Have Data To Back It Up.
Favicon 
www.universetoday.com

We've Long Thought The Surface Area Of A Black Hole Can't Decrease. Now We Have Data To Back It Up.

Observations of a merging black hole further supports the Area Theorem of black hole thermodynamics, which states that the event horizon of a black hole produced by two merging black holes must have a surface area no less than the areas of the original two.