The Planck length - actually a limit on distance itself.

It is the time required for light to travel, in a vacuum, a distance of 1 Planck length.

The Planck length is simply a unit (like a meter or a mile).

Many studies of nature deal with questions that occur at the Planck length, in which ordinary reality doesn't seem to exist.

As you approach the Planck length, the positions of particles start to become extremely uncertain.

Research on the Planck length is therefore mostly theoretical.

You have finally hit rock bottom: a span called the Planck length, the shortest anything can get.

This is close to the limiting Planck length, meters.

The physical significance of the Planck length is a topic of research.

However, this approach fails at short distances of the order of the Planck length.

Instead, they are expected to give rise to space and time at distances which are large compared to the Planck length.

This special distance is called the Planck length ().

It is not smooth but granular, and the Planck length gives the size of its smallest possible grains.

The complication arises because you could counter with - How about 1/2 a Planck length?

The predicted size of this structure is the Planck length, which is approximately 10 meters.

You inhabit a world scaled midway between the Planck length and the diameter of the universe.

Furthermore, any physics smaller than the Planck length probably requires a consistent theory of quantum gravity.

The length of the strings would be determined by Planck length:

In doubly special relativity, the Planck length is observer-invariant.

The Planck length is about 10 times the diameter of a proton, and thus is exceedingly small.

It sounds like you are questioning the existence of the Planck length - is this what you are asking?

Quantum Theory says that any scale smaller than the Planck length is unobservable and meaningless.

The Planck length is related to Planck energy by the uncertainty principle.

In this case the Planck length would have no fundamental physical significance, and quantum gravitational effects would appear at other scales.

"The numbers being manipulated here are greater than the volume of the observable universe, measured in cubic Planck lengths.