SOLAR SYSTEM

Detailed explanation-1: -Galileo Galilei (1564-1642) was part of a small group of astronomers who turned telescopes towards the heavens.

Detailed explanation-2: -Galileo’s telescope Galileo was the first to point a telescope skyward. He was able to make out mountains and craters on the moon, as well as a ribbon of diffuse light arching across the sky-the Milky Way. He also discovered the rings of Saturn, sunspots and four of Jupiter’s moons.

Detailed explanation-3: -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. It had a convex objective lens and a concave eyepiece in a long tube.

Detailed explanation-4: -In the second century BCE, the famed Greek astronomer Hipparchus of Nicaea compiled the first stellar catalogue. A record of his work was handed down by Ptolemy, an astronomer writing three hundred years later at Alexandria – by then part of the Roman Empire.

Detailed explanation-5: -Nicolaus Copernicus (1473–1543) was a mathematician and astronomer who proposed that the sun was stationary in the center of the universe and the earth revolved around it.