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322 BCE
Aristotle
Aristotle was a Greek philosopher and scientist who is still considered the greatest thinker of politics. He believed that the earth was the center of the universe and that everything orbited around earth. -
168
Ptolemy
100-168 AD Ptolemy was a Greek philosopher and mathematician. He believed that the earth was the center of the universe just like Aristotle. He called this theory geocentric. He thought that the planets must move in smaller circles around the earth and the earth itself moved along an equant. -
1543
Copernicus
1473-1543 Copernicus was a Polish astronomer who put forth the theory that the sun was at rest near the center of the universe. The earth was spinning on an invisible axis spinning around the sun daily. This was called the sun- centered system. -
Tycho Brahe
1546-1601 Tycho Brahe made some of the most accurate observations of planetary positions. He was also the one that helped overturned the belief that the earth was in the center of the universe and as a new belief he gestured that the sun was in the center of the universe. -
Hans Lippershey
1570-1619. Hans Lippershey was a dutch eye glass maker. He invented the first telescope and is sometimes credited for the compound microscope. He was was born in Wesel, Germany and settled in the Netherlands, opening a spectacles shop in Middleburg. -
Johannes Kepler
1571-1630. Johannes Kepler was a German astronomer, mathematician and a astrologer. He was best know for defining the laws regarding planetary motion. Kepler was also the first person to determine the refraction drives vision in the eye. -
Galileo
Galileo was an Italian astronomer, physicist and engineer, sometimes described as polymath. He has been called the “ father of modern physics “. His observations strengthened the amount he believed in the Copernicus theory. Galileo died on January 8, 1642 at age 77. -
Giovanni Cassini
Giovanni Cassini was a Italian-born French astronomer. He discovered the four satellites of the planet Saturn. He also discovered the Cassini Division. This is the dark gap between A and B of Saturn. -
Sir Isaac Newton
Sir Isaac Newton was most famous for law of gravitation. Which states any particle of matter in the universe attracts any other with a force varying directly as the product of the masses and inversely as the square of the distance between them. He played a great role in the Scientific Revolution. -
William Herschel
William Herschel was a German-born British astronomer and composer. He found the planet Uranus and its two moons and made a theory of stellar evolution. Herschel was also the first astronomer to suggest that nebulae are composed of stars. Before he got into this he was a music teacher. -
Percival Lowell
Percival Lowell was an American astronomer who predicted that the existence of a planet beyond the orbit of Neptune. This search ended when they discovered Pluto. Soon Lowell decided to spend his time and fortune to study mars because he got inspired by a scientist who said there were canals on mars. -
Karl Jansky
Karl Jansky was the first person to discover radio waves that come from the Milky way. He built a huge radio that people could talk to other people with. There was a lot of static and they wanted less so they continued working on it. -
Edwin Hubble
Edwin Powell Hubble was an American astronomer. He invented the Hubble Space telescope. Many people say he made the most important discoveries in modern astronomy. -
Albert Einstein
Albert Einstein is best known for his theory of relativity and the equation E=MC2, which foreshadowed the development of atomic power and the atomic bomb. This equation suggested that tiny particles of matter could be converted into huge amounts of energy, a discovery that acclaimed atomic power. -
Sputnik
The first satellite to be placed in orbit. -
Ejnar Hertzsprung
Ejnar Hengrtzspruwas a astronomer who classified types of stars by relating the color to brightness. He was the first person that discovered that there is a absent of stars in a limited space. -
Yuri Gagarin
Yuri Gagarin was a pilot and cosmonaut. He became the first human to journey into outer space when his Vostok spacecraft completed on orbit around the earth. They took off on April 12, 1961 and I toasted 108 minutes. In 1955 he was drafted into the army, he was soon assigned to the Air Force. -
The Apollo Program
This was the third United States human spaceflight program. This program was designed to land humans on the earth and bring them back safely. -
The first space shuttle
This was called the Columbia. This was the first spaceship to safely reach the moon in 1981. This ship carried many people and accomplished 28 missions. -
Mars Pathfinder Expedition
Mars Pathfinder Expedition was launched December 4, 1997 and landed on mars on July 4, 1997. The Mars Pathfinder Expedition is an American robotic spacecraft that landed a base station. -
Cassini orbiter
The mission that used this instrument was very hard and dangerous. There mission was to reach Saturn. This mission was a success. the spacecraft was capable of taking accurate measurements and detailed images in a variety of atmospheric conditions and light spectra. -
Neil Armstrong
Neil Armstrong was the first man to walk the moon. He was born in Ohio and started his NASA career there. He has been on several missions and all have been a success. -
John Glenn
John Glenn was born in Ohio. He was attending collage while the US was entering World War ll. He left collage and joined the military. He later became a marine pilot. All that hard work paid off when he flew in the Korean War. After the Korean War he continued flying and set an unbelievable speed record for aircrafts. After his marine pilot career he became a astronaut. Glenn was one out of a group of astronauts to first orbit the earth that NASA selected. After that he became US senator. -
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