Gravity is a fundamental force of nature that attracts two bodies with mass toward each other. It is responsible for the phenomena we observe, such as objects falling to the ground, planets orbiting stars, and the formation of galaxies. In physics, gravity is described by Isaac Newton's law of universal gravitation and is further explained by Albert Einstein's theory of general relativity, which views gravity as the curvature of space-time caused by mass. In everyday terms, gravity keeps us grounded on Earth.

In the context of Earth, 9.8 m/s² is the acceleration due to gravity at sea level, meaning that an object will accelerate towards the Earth at this rate if no other forces act on it. However, in the movie "Gravity," which is set in space, the concept of gravity is more complex. The characters experience microgravity or weightlessness, which occurs in orbit due to the continuous free fall towards Earth. While gravity is still present, the sensation of weightlessness results from their orbital motion.

Gravity is a force that pulls things toward each other. Imagine you're holding a ball and you let it go; it falls to the ground because the Earth pulls it down. Everything with mass, like planets and stars, has gravity. The bigger something is, the stronger its gravity. That's why we stay on the ground instead of floating away! In space, gravity still works, but it's weaker the farther you get from a big object. In the movie "Gravity," astronauts experience this as they work around Earth in space.

Gravity is both a theory and a fact. As a fact, it refers to the observable phenomenon where objects with mass are attracted to each other, resulting in weight and influencing motion. As a theory, it encompasses the scientific explanations of gravitational forces, such as Newton's law of universal gravitation and Einstein's general relativity, which describe how gravity works in different contexts. In essence, gravity is a fundamental force of nature that is well-established through empirical evidence and mathematical models.