This is a list of some of the major unsolved problems in physics. Some of these problems are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result. The others are experimental, meaning that there is a difficulty in creating an experiment to test a proposed theory or investigate a phenomenon in greater detail.
String theory addresses several unsolved problems in physics. The oldest of these arises from Newton’s theory of gravity, which handily explains the motion of familiar objects such as ripe plums and planets. But Newton’s work, successful as it is, can only explain the motion of objects moving at fairly slow speeds. Einstein’s theory of relativity, proposed more than 200 years later, provides a foundation for much of theoretical physics and accounts for some of the universe’s more extreme and spectacular kinds of motion, motion as fast as the speed of light.
TOP TEN UNSOLVED PROBLEMS IN PHYSICS
Turbulence is not one of the great unsolved problems in physics. Physics tells us exactly how turbulence emerges as a direct consequence of local mass and momentum conservation. We can create multiparticle computer models such as lattice gas automata that generate turbulence at large length and time scales. We can write down the equations that govern turbulence. These are the Navier-Stokes equations.