Gravity is a fundamental force of attraction that acts between all objects with mass or energy. It is the force that pulls objects toward each other, such as the Earth pulling you toward its center, which is why things fall down when dropped and why you stay grounded instead of floating into space
. The strength of gravity depends on the mass of the objects and the distance between them: the more massive the objects and the closer they are, the stronger the gravitational pull
. For example, Earth's large mass creates a strong gravitational force that keeps the Moon in orbit and holds all planets in orbit around the Sun
. From a physics perspective, gravity was first described by Isaac Newton as a force proportional to the product of masses and inversely proportional to the square of the distance between them. Later, Albert Einstein’s general theory of relativity redefined gravity not as a force but as the curvature of spacetime caused by mass, with objects moving along curved paths in this spacetime
. Despite being the weakest of the four fundamental forces in nature, gravity governs the motion of planets, stars, galaxies, and the structure of the universe on large scales. It also influences biological processes on Earth, such as plant growth and fluid circulation in organisms
. In summary, gravity is the universal attraction between masses, responsible for the weight we feel on Earth, the orbits of celestial bodies, and the large-scale structure of the cosmos, explained both by Newtonian mechanics and Einstein’s theory of curved spacetime
