Everyone understands what happens as a result of gravity- things fall down unless they are restrained. However, the general public is unaware of how exactly gravity works and why.
Gravity is a function of the relative masses of the objects under consideration along with the distance between them. Theoretically, every object in the universe attracts every other object in the universe; such is the ubiquitous nature of gravity. It is the first of the four fundamental forces that were discovered by humans, but still, is the least understood!
That is, because, we still haven’t been able to pinpoint, with complete accuracy the fundamental sub-atomic particle responsible for imparting mass to every object in the visible universe. As soon as we solve this mystery, we will be in a position to understand gravity on a much profound level and also comprehend what its full repercussions might be.