Gravity: What is it? What does it do?
You typically learn that gravity is the force that holds you to Earth and keeps you from floating off into space, but it is much, much more than that. Gravity keeps the planets in orbit, keeps the moon in revolution, and holds the solar system and galaxies in one huge piece full of many different things. Gravity is the force that attracts all objects to each other.
Newton’s Universal Law of Gravitation
Newton’s Universal Law of Gravitation says that every object has a gravitational attraction to every other object. This explains why things fall, and why the sun, earth, and all the other bodies don’t just crash into one another, it’s because the matters are pulling on one another.
Einstein’s Theory of Relativity
He discovered space and time were woven together one continuum known as space-time, making it so that one spectator could observe the same thing as another at different times. Einstein came up with the brilliant idea of the relativity theory, which states that massive objects in space causes a distortion in space-time known as gravity.