# Blog

## How long is a Planck time?

• Planck time is roughly 10−44 seconds. However, to date, the smallest time interval that was measured was 10−21 seconds. One Planck time is the time it would take a photon travelling at the speed of light to cross a distance equal to one Planck length .

## What is Planck distance?

• The more correct name is the Planck distance! and the definition of the Planck distance is the distance that energy travels through energy during a Planck time interval. The Planck distance divided by the Planck time interval is always the speed of light.

## What is the Planck scale?What is the Planck scale?

Freebase(0.00 / 0 votes)Rate this definition: Planck scale. In particle physics and physical cosmology, the Planck scale is an energy scale around 1.22 × 1019 GeV at which quantum effects of gravity become strong.

## How long is a Planck time?How long is a Planck time?

Planck time is roughly 10−44 seconds. However, to date, the smallest time interval that was measured was 10−21 seconds. One Planck time is the time it would take a photon travelling at the speed of light to cross a distance equal to one Planck length.

## What is Planck distance?What is Planck distance?

The more correct name is the Planck distance! and the definition of the Planck distance is the distance that energy travels through energy during a Planck time interval. The Planck distance divided by the Planck time interval is always the speed of light.