““What those two young physicists did remains the most important step yet made in the search for quantum gravity. They gave us two general and simple laws, which were the first physical predictions to come from the study of quantum gravity. They are: Unruh's law. Accelerating observers see themselves as embedded in a gas of hot photons at a temperature proportional to their acceleration. Bekenstein's law With every horizon that forms a boundary separating an observer from a region which is hidden from them, there is associated an entropy which measures the amount of information which is hidden behind it. This entropy is always proportional to the area of the horizon.””
