Physicists have long assumed that the size of these cells is the Planck length( lP) of10-35 meter, which is the distance at which both quantum fluctuations and gravitational effects are important.

• 物理学家一向假定这些泡沫单元的大小为普朗克长度（P,10-35公尺）在此距离範围内，量子涨落与重力效应都很重要。