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Period: 100 to 160
Ptolemy
Ptolemy was an astronomer and mathematician. He believed that the Earth was the centre of the Universe. -
Period: 1501 to 1503
Nicolaus Copernicus
Nicolaus Copernicus formulated a model of the universe that placed the Sun rather than the Earth at the centre of the universe -
Period: 1581 to
Galileo Galilei
His discovery of the four most massive moons of Jupiter, now known as the Galilean moons -
Period: 1582 to
Edmond Halley
He was the second Astronomer Royal in Britain, succeeding John Flamsteed in 1720. From an observatory, he constructed on Saint Helena. Halley recorded a transit of Mercury across the Sun. -
Period: to
Johannes Kepler
Johannes Kepler discover Kepler's three laws of planetary motion. -
Period: to
William Hershel
William Hershel Discovered Uranus. -
Period: to
Discovery of the first four asteroids
Piazzi named it after Ceres, the Roman goddess of agriculture. Three other asteroids (2 Pallas, 3 Juno, and 4 Vesta) were discovered over the next few years with Vesta found in 1802 -
Period: to
Urbain Le Verrier
Urbain Le Verrier discovered Neptune -
Period: to
Clyde Tombaugh
Discovered Pluto -
Period: to
Voyager 1
Voyager 1 is a space probe launched by NASA on September 5, 1977. Part of the Voyager program to study outer Solar System. Voyager 1 launched 16 days after its Voyager 2