WORLD HISTORY

Detailed explanation-1: -Galileo supported the heliocentric (Sun-centered) theory of Copernicus. Galileo believed that his new invention, the astronomical telescope, could help him prove that the Sun was the center of our solar system and that Earth was just one of many planets orbiting our star.

Detailed explanation-2: -Galileo’s Telescopes The basic tool that Galileo used was a crude refracting telescope. His initial version only magnified 8x but was soon refined to the 20x magnification he used for his observations for Sidereus nuncius.

Detailed explanation-3: -He discovered that the sun has sunspots, which appear to be dark in color. 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-4: -In 1609, he learned of the spyglass and began to experiment with telescope-making, grinding and polishing his own lenses. His telescope allowed him to see with a magnification of eight or nine times, making it possible to see that the Moon had mountains and that Jupiter had satellites.