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322 BCE
Aristotle
Believed that earth was round, was the center of the universe, and that the stars, planets, the sun, and the moon revolve around earth. -
120 BCE
Hipparchus
Calculated the length of the year within 6 1/2 minutes, compiled the first star catalog, and created the early form of triganometry -
117
Ptolemy
He believed the earth was round and he called his idea the geocentric theory. -
May 21, 1542
Copernicus
After everyone believed that the earth was the center of the universe Nicolaus Copernicus proposed that the planets actually revolve around the sun. -
Dec 27, 1571
Johannes Kepler
Kepler's laws are that all of the planets move in orbit of the sun, a radius vector joining any planet to the Sun sweeps out equal areas in equal lengths of time, and the square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit. -
Tycho Brahe
Helped overturn favor to the heliocentric belief of astronomy. -
Hans Lippershey
Created the first telescope. -
Giovanni Cassini
Discovered the difference in the darkness in Saturn's rings, the spaces between them, and Saturn's 4 moons -
Galileo
Used his newly invented telescope to look at moons revolving around Jupiter which strengthened the heliocentric theory. -
Sir Isaac Newton
States that a particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. Reflecting telescope. 3 laws of motion. -
William Herschel
The founder of sidereal astronomy for the systematic observation of the heavens. Discovered Uranus. Determined the temperature of the different colors of sunlight passed through a prism. -
Percival Lowell
Fueled speculation that there were canals on Mars. Discovered Pluto -
Ejnar Hertzsprung
Together with Henry Norris Russell, he developed the Hertzsprung–Russell diagram that plotted the absolute magnitude of stars against their color. -
Albert Einstein
Equation that helped explain special relativity – E = mc2 – and gravitation. -
Edwin Hubble
Played a crucial role in establishing the fields of extragalactic astronomy and observational. Big Bang Theory. Universe moving away from eachother. -
Karl Jansky
In August 1931 first discovered radio waves emanating from the Milky Way. He is considered one of the founding figures of radio astronomy. -
John Glenn
He was an aviator, engineer, astronaut, and United States Senator from Ohio in the marine corps. He was the first american to orbit space when he orbited earth 3 times. 1962. -
Neil Armstrong
He was an American astronaut, engineer, and the first person to walk on the Moon. Began working at NASA after being a naval aviator. 1969- Gemini 8 and Apollo 11. -
Yuri Gagarin
He was a soviet cosmonaut and pilot. He was the first human to go into outer space when his Vostok spacecraft orbited earth. 1961 -
Sputnik
Sputnik 1 was the first artificial satellite that the soviet union sent out into space. It is 23 inches in diameter and has orbited earth 1440 times. -
Period: to
Apollo Missions
The Apollo Program was a series of missions that involved many spacecrafts that took humans to the moon and back. -
First Space Shuttle flight- Columbia
Launch like a rocket and lands like a plane. -
Mars Pathfinder Expedition
