Greek astronomer Claudius Ptolemy proposed the first solar system model known as the geocentric theory. Which features the earth in the middle of the solar system.
Period: 1473 to 1543
The geocentric was disproved although it lasted a long time by Nicolaus Copernicus. It was replaced with a new theory known as the heliocentric theory which features the Sun in the middle of the solar system.
Period: 1531 to
Edmund Halley discovered comets that orbits the earth he reasoned that the 4 comets came back every 76 years.
Period: 1564 to
Galileo Galilei mad significantly improved the solar system model to the telescope and discovered the earth could not be orbited.
Johannes Kepler found out that Mars and Venus appeared at different times which meant it was impossible for it to orbit in circles.
Isaac Newton created a model most similar to Keplers but proved why the planets orbiting are called ellipses and why the revolutions have changed.
William Herschel discovered Uranus while surveying the stars with a telescope. He also discovered the two moons of Uranus.
French astronomer Leo Verrier discovered neptune
Clyde Tombaugh discovered Pluto the first object found in Kuiper Belt.
Voyager 1 and 2 are launched by NASA to study the outer solar system.