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384 BCE
Aristotle
384-322 Aristotle was a famous Greek philosopher and scientist born in Stagira, Greece. He is most famous for being one of the greatest thinkers in history, ethics, psychology, and politics were what he was best known for. Even though he was a smart scientist he was a student of Plato and admired and studied Socrates. -
100
Ptolemy
100-168 AD Born in Alexandria, Egypt Claudius Ptolemy was a Roman mathematician, astronomer, geographer and astrologer, he is famous for concerting that the Earth was the center of the Universe. He then proposed a geocentric system that was not used until the late Renaissance. -
1473
Copernicus
1473-1543 Copernicus is famous for making "De Revolutionibus Orbium Coelestium" ("On the Revolutions of the Heavenly Spheres"). He realized that the planets orbited the sun and not the earth. He layed out his plans and made a circular chart that showed that the sun make the planets orbit. -
1546
Tycho Brahe
1546-1601 Tycho Brahe was a Danish nobleman and astronomer he was one of the astronomers whose work helped destroy the belief that the planets revolved around the Earth. He helped by developing astronomical instruments and in measuring the stars and fixing errors that old astronomers made. -
1564
Galileo
1564-1642 Galileo is most known for his discovery of the massive moons of Jupiter; Ganymede, Europa and Callisto. They named one of the missions to Jupiter was called Galileo in honor of him. He made many observations about our solar system. -
1570
Hans Lippershey
1570-1619 Hans Lippershey is commonly mistaken for invention of the telescope but he just was the first to try to get a patient for it. It is still unclear if he was the first one to build the telescope. But he was a German-Dutch spectacle-maker. -
1571
Johannes Kepler
1571-1630 Johannes Kepler discovered the 3 laws of planetary motion. His first law was that the planets orbit the sun in a eliptical orbit. His seccond law stated that a line segment connected the sun and the planets. His final and last law was that a period of the planet is proportional to the axes of its orbit. -
Giovanni Cassini
1625-1712 Giovanni Cassini worked with many scientists to discover and associate with projects. He also discovered Saturn´s moons. So in 1997 they launched a Cassini space craft after the famous astronomer, it landed on Saturn in 2017. -
Sir Isaac Newton
1643-1724 Sir Isaac Newton is a famous astronomer who discovered gravity. He was sitting down, above him was an apple tree. Then an apple fell on his head and he got the imitation why the apple went down. He then realized that there was a force that was keeping us to the ground. -
William Herschel
1738-1822 William Herschel was a British astronomer who worked with his brother on several experiments. He is the inventer of sidereal astronomy. He found the planet Uranus as well as its two moons, he also formulated a theory of stellar evolution. -
Ejnar Hertzsprung
1873-1967 Ejnar Hertzsprung used his technique of classified types of stars by relating their color to there brightness. He came up with the idea of how different stars are different colors and wanted to see if the colors meant anything. -
Albert Einstein
1879-1955 Albert Einstein Is one of the most admired scientist and astronomer in history. His famous equation E = mc2 helped enplane special relativity and is admired by everyone, even by people who don't know what it means. E = mc2 means Mass- energy equivalence. It explanes that anything that has mass has an the same amount of energy and vice versa. -
Percival Lowell
1885-1916 Percival Lowell is known for founded the Lowell Observatory in Flagstaff Arizona. He and talked about that there may be life on Mars.This had a huge impact on the way we look at Mars. -
Edwin Hubble
1889-1953 Edwin Hubble played a very important role in helping discover the fields of extragalactic astronomy. He also helped discover the nature of the universe. He is known to be one of the most valued astronomers of all time. -
Karl Jansky
1905-1950 Karl Jansky was a radio engineer. He discovered radio wave from the milky way. He is called one of the fauthers of radio astronomy. -
John Glenn
1921-2016 John Glenn was the first to orbit the Earth, going around it 3 times. He was a part of the astronauts that took a descent into earths orbit. He helped us see into space. -
Neil Armstrong
1930-2012 Neil Armstrong was the first man in history to walk on the moon. He was one of the few to travel on the Apollo space craft and travel to the moon. -
Yuri Gagarin
1934-1968 Yuri Gagarin became the first human to go into outer space. He completed his mission around the orbit of earth. He will be always known as the first man in space. -
Sputnik
1957 Sputnik 1 was the very first artificial Earth satellite that was lanced into the Milky way. It took 98 minutes to orbit. Spunk helped us start to get into space. We got more interested after Spunk gave us a push on see more about our solar system. -
The Apollo Program
1963-1972 The Apollo Program is a program that planed to take 3 astronauts and sent them to the moon. When they got there they were to collect samples and film there experience using NASA's technology. It was a risky and tough journey that now one has ever taken then. -
First Space Shuttle Flight
1981 First Space Shuttle Flight was the first space-rated orbiter in NASA's Space Shuttle. It was lanced April 12, 1981 as the First Space Shuttle Flight. -
Mars Pathfinder Expedition
1996 For the Mars Pathfinder Expedition scientific panted instruments to analyze the Mars atmosphere, climate, geology and the composition. -
Cassini orbiter
1997 Cassini orbiter, named after the famous astronomer, was loaded with powerful instruments and cameras lanced into space. It took measurements and pictures of space. -
Difference between refracting and reflecting telescopes
Refracting is "(of water, air, or glass) make (a ray of light) change direction when it enters at an angle." It is also "the rays of light are refracted by the material of the lens". And a reflecting telescopes is a telescope which uses a single curved mirrors that reflect light form an image. It is an alternative to the refracting telescope, and refracting telescope that just reflects light and form an image.
