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What do you know about Quantum Gravity?
Based on the current state of scientific knowledge, physics is currently unable to explain how gravity works. Gravity may be explained mathematically but not as a thing with substance itself.
This may seem confusing if you are thinking about what we know of as a gravitational force. This is because gravity has not been fully understood, it appears to be a particle that only exists from the perspective of an observer in motion.
A gravitational field is the effect that gravity has on objects, similar to how magnetic fields are generated by moving charged particles. As a result of this it is possible for an object in motion to experience a force without being aware of what exactly caused it.
Gravity is actually the curvature of space-time around objects. It is not a substance as in the many other forces in nature, which are also fields.