10 Biggest Unsolved Mysteries In Science

3. What's Up With Gravity?

Gravity obviously works. Its the reason you're a person stood on a planet and not a cloud of disparate atoms, smeared across a sparse vacuum.

There are a lot of things about gravity that don't make sense. How is it generated? Why doesn't it have an opposing force? Is it actually a particle?

We can't really answer any of those questions using our current models and, for now, many scientists just go with "it works because it does" when factoring it into their calculations.

Our incomplete knowledge of gravity has gotten us pretty far, but neither the Newtonian nor relative models of gravity can adequately explain how the phenomenon is generated.

Quantum field theory attempts to answer many of our questions about gravity. Just as electromagnetic forces are delivered by photons, QTF predicts the existence of a "graviton" that delivers gravitational force, but for now the particle continues to elude us.