The Planck Length: The Smallest Length At Which Space-Time Functions

News: The Curiosity Podcast is here! Subscribe on iTunes, Stitcher, Google Play Music, SoundCloud and RSS.

The Planck length is the theoretical length at which the laws of space-time begin to unravel. It's orders of magnitude smaller than a proton, and unable to be physically measured by any equipment available today. It's defined by three constants: the gravitational constant, the speed of light in a vacuum, and Planck's constant, a value used in quantum mechanics.

Advertisement

Love getting smarter? Sign up to our newsletter and get our best content in your inbox!

Share the knowledge!

Key Facts In This Video

  1. The Planck length is approximately 1.6 x 10^-35 meters. 01:08

  2. The Planck length is calculated using three constants: Planck's constant, the gravitational constant, and the speed of light. 02:41

  3. Space itself is not properly defined on length scales smaller than the Planck length. 04:57

Advertisement