What is the role of gravity in the universe?

Gravity is a fundamental force in the universe that plays a crucial role in shaping the motion of celestial bodies, influencing the structure of galaxies, and governing the formation of stars and planets.

Celestial Bodies

Gravity is responsible for the motion of celestial bodies such as planets, moons, asteroids, and comets. It keeps these bodies in their orbits around larger objects like stars or planets, ensuring the stability of the solar system and other planetary systems in the universe.

Galaxies

Gravity also influences the structure of galaxies. It attracts stars, gas, and dust towards each other, leading to the formation of galaxies. The gravitational pull of galaxies also keeps them bound together in clusters, contributing to the vast cosmic web of the universe.

Stars and Planets

Gravity governs the formation of stars and planets from massive clouds of gas and dust. As these clouds collapse under their own gravity, they heat up and ignite nuclear fusion, giving birth to stars. The remaining material in the disk around a star then clumps together due to gravity, forming planets, moons, and other celestial bodies.

In conclusion, gravity is a fundamental force that shapes the cosmos, from the smallest planet to the largest galaxy, playing a vital role in the structure and evolution of the universe as we know it.