SOLAR SYSTEM

Detailed explanation-1: -Galileo’s discoveries about the Moon, Jupiter’s moons, Venus, and sunspots supported the idea that the Sun-not the Earth-was the center of the Universe, as was commonly believed at the time.

Detailed explanation-2: -Its gravity holds the solar system together, keeping everything from the biggest planets to the smallest bits of debris in orbit around it.

Detailed explanation-3: -Nicolaus Copernicus’ major theory of a heliocentric model was published in De revolutionibus orbium coelestium (On the Revolutions of the Celestial Spheres), in 1543, the year of his death, though he had formulated the theory several decades earlier.