Centuries later, Albert Einstein suggested, through his theory of general relativity, that gravity is not an attraction or a force. It's also why archaeologists can use carbon-14 to date ancient bone, wood and other formerly living artifacts.

What are opposites in nature? - Crabtree Publishing

This decay happens at a predictable rate, allowing scientists to determine how old such artifacts are. Gravity is the attraction between two objects that have mass or energy, whether this is seen in dropping a rock from a bridge, a planet orbiting a star or the moon causing ocean tides. And at the molecular and atomic levels, gravity has almost no effect relative to the other fundamental forces.The force-carrying photons that swap between charged particles, however, are a different manifestation of photons.

OPPOSITION, DETERMINISM, INEVITABILITY, AND CONFLICT

But once set into motion, those charged particles begin to display the second component, the magnetic force. Though gravity holds planets, stars, solar systems and even galaxies together, it turns out to be the weakest of the fundamental forces, especially at the molecular and atomic scales. The force that keeps a book on top of a table (instead of gravity pulling the book through to the ground), is a consequence of the electromagnetic force: Electrons in the table's atoms repel electrons in the book's atoms. The normal force that keeps a book on top of a table (instead of gravity pulling the book through to the ground), for example, is a consequence of electrons in the table's atoms repelling electrons in the book's atoms.Gravity is probably the most intuitive and familiar of the fundamental forces, but it's also been one of the most challenging to explain.