Quantum gravity is a branch of theoretical physics seeking to merge quantum mechanics and general relativity into a single theory that describes matter and energy at all scales, including in strong gravitational fields. The challenge is that these two successful theories are incompatible with each other and make different predictions. Some approaches to quantum gravity include string theory and loop quantum gravity, both of which propose new ways of looking at the building blocks of the universe and the structure of spacetime. Despite some progress, much work remains to be done in the field and the theory of quantum gravity remains speculative. A successful theory of quantum gravity would have significant implications for our understanding of the universe.
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