### Bekenstein Bound

Theoretical physical limit to the flow of information through the universe. As the area of a given surface limits the amount of information about the universe on one side of it that can pass through it to an observer on the other side. The number of bits of information the observer can gather cannot be greater than one-quarter the area of the surface in Planck units. (Planck unit = 1.61624 Å — 10-35 m)