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View submission: Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science
As someone with a Ph.D. in physics, the off-the-top-of-my-head, guesstimate, intuition based answer would be that physics is 95% complete. The only things really missing in physics is the unification of relativity and high-energy physics, larger cosmological questions like the ultimate fate of the universe, and what the hell dark matter and dark energy is. Compared to all that we do know that's not really a lot of things.
There's nothing here!