-
Claudius Ptolemy, who was a Greco-Roman mathematician, astronomer, geographer, astrologer discovered a theory for geocentrism.
-
Nicolaus Copernicus who is mathematician and astronomer formulated a model and published a book of Heliocentrism
-
Galileo Galilei observed/confirmed the phases of Venus, four largest satellites of Jupiter, Saturn and the analysis of sunspots using the telescope.
-
Johannes Kepler, who was a German mathematician, astronomer, and astrologer discovered Laws of planetary motion
-
Edmond Halley, who was an english astronomer and mathematician that calculate the orbit of a comet later named after him.
-
William Herschel who was a German-British astronomer, composer discovered a planet Uranus during the research of Double star
-
Neptune was found by Urbain Le Verrier, the French mathematician who studied about the planets Mercury and Uranus using his own calculation
-
Clyde William Tombaugh was an American astronomer. He discovered Pluto in 1930, the first object to be discovered in what would later be identified as the Kuiper belt.
-
These satellites were launched out to study other planets.