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one of the inventors of the Hertzsprung Rusell diagram. The HR diagram shows the correlation between tempature absoulote magnitude and brightness and the spectral type of star.
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Theory of Relativity 1905 and gravitation.
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using the color of the stars discovered the universe is expanding. Hubbles Law galaxies are moving away from each other. The idea is the basis of the Bing Bang Theory of how the universe began.
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Discovered the planet pluto and studied the canalis on Mars. Built the lowell observotory in Flagstaff AZ to study Mars.
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Discovered the planet Uranus and its moons. He also discovered 2 more of Saturns moons. Believed to have found polar ice on Mars leading to the studies hoping to find water on Mars.
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Further developed works of Copernicus and Kepler using math. invented reflecting telescope.
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italian who discovered the division of the rings of saturn. 4 of saturns moons and the rotation periods of Mars and jupiter. Cassini space mission to saturn named after him.
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used a refracting telescope to prove not all things revolve around the Earth. Disproving the Ptolemaic or geocentric model and making the heliocentric model more accepted although not without controversy. He also discovered suns spots the 1st four moons of jupiter the diffrent features of the moon and discovered that Venus goes through phases similar to the moon.
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Tycho Brahes assistant. Discovered that the orbit of the planets are not circular but elliptical.
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was a lens maker from Germany but moved to the Netherlands. Believed to be the first to apply for a patent for the telescope desighn of 3x magnification.
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spent 20 years of his life taking the most precise measurements within 2 arc minutes of the movements of the stars and planets.
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Read ptomelys Almagest and proposed copernicus heliocentricism. The Sun is the center of the universe with the planets rotating around it. Even though it was proposed by Aristarchus 1750 years before.
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proved earth is spherical but also believed in a geocentric model in witch the sun, other planets and the stars were a part of other spherical shells that surrounded and revolved around the Earth.
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wrote almagest a set of astronomy manuals whitch catalouges the stars, eclisps the movement of the sun and moon. His model is the geocentric theory and also called the ptomelic Model. he relied Hipparchus astronomy work for the star catalog