5 ms·

It is an analogy that is used to describe spacetime curvature though… its the wrong analogy.

• varjag 3y ago
  No it's an analogy used to describe inflation with no boundary.
  • oneshtein 3y ago
    Air balloon has clear boundary.
    • consilient 3y ago
      The volume enclosed by the balloon's surface has a boundary, the surface itself does not.