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1.616 × 10⁻³⁵ m → ≈15 fm

Quantum scale
Where ordinary pictures of matter stop working.

At quantum scales, “size” is often a measured radius, a reference length or a probability distribution rather than a hard surface. This realm begins at the Planck length and reaches the largest atomic nuclei.

Enter this realm in the scale engine
Visual evidence plate for Planck length
3 landmarks21.0 orders of magnitude

Questions this realm answers

Start with curiosity.

  1. Is the Planck length the smallest possible thing?
  2. How large is a proton?
  3. Why does a nucleus occupy so little of an atom?

3 source-backed coordinates

Every landmark in quantum scale.

Ordered by the actual logarithm of its SI value.

Visual evidence plate for Planck length
10-34.8 m · Fundamental physics

Planck length

1.616 × 10⁻³⁵ m

A fundamental length scale built from physical constants, not a tiny bead waiting to be photographed.

Visual evidence plate for Proton
10-14.8 m · Fundamental physics

Proton

≈1.68 fm

A positively charged component of atomic nuclei, described by quantum fields rather than a hard outer shell.

Visual evidence plate for Uranium nucleus
10-13.8 m · Fundamental physics

Uranium nucleus

≈15 fm

One of the largest naturally occurring atomic nuclei, still vastly smaller than the atom around it.

Guided routes

Meet this realm inside a story.

Life · 6 minYou are a universe

Move inward from a human body to cells, molecular machinery, atoms and the physical limit where ordinary ideas of size stop behaving normally.

Begin expedition →