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Galileo Galilei recreates the telescope
In 1609, Galileo Galilei improved the design of the telescope, increasing its magnification up to 30 times, and used it to make groundbreaking astronomical discoveries, such as observing mountains and craters on the Moon, discovering four moons orbiting Jupiter, identifying countless stars in the Milky Way, and providing strong evidence for the heliocentric model of the solar system, which proposed that the Earth and other planets revolve around the Sun. -
Galilea discovers Jupiter’s biggest moons
In 1610, using a telescope he had improved himself, Galileo Galilei discovered the four largest moons of Jupiter—Io, Europa, Ganymede, and Callisto—by observing tiny points of light that appeared to move around the planet night after night, leading him to realize they were orbiting Jupiter, not Earth. -
Issac newton discovers gravity
Isaac Newton discovered the concept of gravity after observing an apple fall from a tree, which led him to wonder why objects always fall straight down, inspiring him to theorize that a universal force, which he later called gravity, pulls all objects toward one another, and that this same force governs the motion of planets and moons in space.