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384-322 Aristotle born in Greece, he was a scientist and philosopher, was a student of Plato, Alexander the great became his student. He made more than 200 works, these works include scientific studies,observations, and poetry.
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100-168 Ptolemy wrote the Almagest. He was an astronastronomer, geographer, and mathematician. He thought that the earth was the in the middle of the universe.
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1473-1543 Copernicus was an astronomer, mathematician and scientist. He thought the sun was in the middle of the universe, instead of the earth.
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1546-1601Tycho Brahe was an astronomer who worked as a developing astronomical instruments. Tycho Brahe made the Tychonic system. The Tychonic system was a model of the solar system.
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1570-1619 Hans Lippershey was a German-Dutch spectacle-maker. He created the first telescope and many believed he also made compound microscope.
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1571-1630 Johannes was a German astronomer, mathematician, and astrologer. Many people think he was the key for the 17th-century scientific revolution. He discovered Kepler conjecture, Kepler's laws of planetary motion, and Rudolphine Tables.
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1564-1642 Galileo was an Italian astronomer, physicist and engineer, who invented the Scientific method , along with other observations that supported Copernicanism.
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1625-1712 Giovanni Cassini was Italian mathematician, astronomer and engineer. He was known for discovering 4 satellites on Saturn and wrote down how many rings are on Saturn.
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1643-1742 He was developed Copernicus and Kepler, he invented the Reflecting telescope.
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1738-1822 William Hershel found the planet Uranus and all its moons, and two more of Saturn's moons. Many people also think that he founded ice on Mars.He invented the infrared light and electromagnetic spectrum.
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1855-1916 Percival Lowell was a man who discovered Pluto. He also made Lowell Observatory in Flagstaff to study Mars.
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1905-1950 Karl Jansky Discovered Radio waves that are from space. Later found out that radio waves are the longest type of energy waves.
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1889-1953 Edwin Hubble used the color of stars, and discovered the Universe is expanding. He found that the galaxies are moving away from each other.
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1879-1955 Albert Einstein made a theory about Relativity and gravity.
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1957 Sputnik is a satellite. In the middle of the Cold war, Russia was successful in launching the first satellite into space to orbit Earth.
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1961 Was the first human to orbit the Earth
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1962 John Glenn was the first U.S Citizen to orbit Earth
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1873-1967 Ejnar Hertzsprung is one of the inventors in the Hertzsprung Russel diagram. It shows the correlation between temperature, and absolute magnitude.
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1969 Neil Armstrong walked on the moon
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1963-1972 The Apollo Program was designed to land people on the Moon and bring them back to Earth
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1981 First Space Shuttle flight was a program was the fourth human spaceflight
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1996
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1997 Cassini orbiter Cassini orbiter was a mission to study the planet Saturn, and its rings.
