Ask Ethan: Could gravity operate in extra dimensions?

There’s a problem with gravity that no one is comfortable with, and that even physicists rarely talk about. If you take any two particles with a mass to them — like two electrons, two of the quarks within a proton or neutron, or even composite particles like two protons — you’ll be able to calculate the strength of all four of the fundamental forces between them. When you do those calculations for the strong and weak nuclear forces, the electromagnetic force, and gravity, you’ll discover something that may puzzle you: the force of gravity, particularly at small distances, is far, far weaker than any of the other forces. Inside a neutron, for example, the force of gravity is more than 30 orders of magnitude (a factor of ~10³⁰) weaker than each of the other three fundamental forces. <a href="https://medium.com/starts-with-a-bang/ask-ethan-could-gravity-operate-in-extra-dimensions-7c1fa05fcc28">Learn More</a>