Why is a Planck’s length the smallest possible distance?

Question

I know it’s only theoretical, but why couldn’t something be just slightly smaller?

In: 658

Answer 1

With plank length it’s believed it’s physically impossible to measure anything smaller than that.

For example to measure something using light the wavelength of light needs to be shorter than the thing you’re measuring (this is how they fit more data on a BluRay disc than a DVD btw, by using a shorter wavelength laser so they can use a thinner data track and fit more tracks on the disc).

Shorter wavelengths of light need more energy to create though. So if you do the calculations on trying to create a laser with a wavelength of less than Planck length you’d find your photons would have so much energy that they would instantly form miniature black holes and disappear…