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322 BCE
Aristotle
Aristotle was born in 384 BC and lived to 322 BC, he was a Greek Philosopher, a scientist, and one of the most intellectual figures of Western History.He made contributions to logic,metaphysics, mathematics, and believed in the geocentric theory. -
168
Ptolemy
Ptolemy lived through 100-168 AD and was a Egyptian astronomer, mathematician, and geographer of Greek descent. Most of his writings represent the achievement of Greco-Roman science particularly his geocentric model of the universe AKA Ptolemaic system.His greatest contribution was by presenting the motions of each of the planets. -
May 24, 1543
Copernicus
Copernicus lived to 1473 to 1543 AD he was a polish astronomer who figured that the Sun is at rest near the center of the universe and that the Earth spinning on its axis once daily revolves around the sun. -
Oct 24, 1543
Tycho Brahe
Tycho Brahe lived through 1546-1601 AD was a Danish astronomer and figured out the best possible before the invention of the telescope included a study of the solar system and the most accurate positions of more than 777 fixed stars. -
Feb 15, 1564
Galileo
Galileo lived to 1564 to 1642 AD and was an Italian astronomer and made major contributions to science by finding mountains on the moon and was known as "The Father of Modern Science." -
Hans Lippershey
Hans was a German-Dutch spectacle maker who was the first one to really perfect the telescope and had some more inventions including the invention of the compound microscope. -
Johannes Kepler
Johannes was a German astronomer and lived to 1571 to 1630 and was best known for creating the laws of planetary motion which are -1. All planets orbit around the sun 2. A radius vector joining any planet tot he sun sweeps out equal areas in equal lengths of time. -
Giovanni Cassini
Giovanni was a Italian astronomer, mathematician, and engineer who lived to 1625 to 1712 AD who discovered the four satellites of Saturn and also noted the division of the rings of Saturn and the Cassini division is named after him which is the gap between Saturn's rings which is because of the gravitational pull from Saturn's moon which is named Mimus which keeps the area clear of many small particles which might damage Saturn's rings. -
Sir Isaac Newton
Sir Isaac Newton lived in 1643-1727 and was a English Mathematician, physicist, and astronomer. He was one of the most successful astronomers to ever live. He contributed very greatly by creating the three laws of motion which are 1. Objects in motion tend to stay in motion unless forced upon a act to stop moving and stopped objects will stay stopped unless forced to move. 2. Force equals mass multiplied by acceleration. 3. For every action there is an equal and opposite reaction. -
William Herschel
Herschel was a German astronomer and composer who lived in 1738-1822 and is most famous for being the founder of sidereal astronomy and for observing the heavenly bodies and also found the planet Uranus and two of its moons Titania and Oberon. -
Percival Lowell
Percival Lowell lived in 1855-1916 was an American astronomer, author, and mathematician and was mos famous for finding canals on Mars and also has an observatory it Flagstaff Arizona. -
Karl Jansky
Karl Jansky lived in 1905 to 1950 was an american physicist and astronomer who first discovered radio waves emanating from the milky way. he is considered one of the founding figures of radio astronomy -
Edwin Hubble
Edwin Hubble an American astronomer lived in 1889-1953 and helped revolutionize the field of astronomy and his research helped prove that the universe is expanding and he also created a classification system for galaxies that has been used for several decades. -
Albert Einstein
Albert Einstein lived in 1879-1955 and is one of the most successful astronomers of his century. He made many inventions including one of our household items the refrigerator and also created the gas absorption heat hump.His nickname was the dopey one. He also married one of his students and one of his cousins Elsa Einstein and Mileva Maric. -
Sputnik
Sputnik was the first artificial Earth satellite which was first launched October 4,1957 by the soviet union and it orbited for three weeks before it's batteries finally died than two months lated falls into the atmosphere. -
Ejnar Hertzsprung
Ejnar was a Danish astronomer who lived in 1873-1967 who classified types of stars by relating their color to their absolute brightness which was an major accomplishment to modern astronomy. -
Yuri Gagarin
Yuri Gagarin was a soviet astronomer and astronaut and was huge for the soviet union when he became the first person to go into space on April 12th, 1961.He made a 108 minute voyage in his Vostok 1 spacecraft. -
The Apollo Program
The Apollo program also known as project Apollo was the third United States human spaceflight program designed by NASA which hosted the missions Apollo 11,13,1,17,8 and many more. They were also the first people to successfully put a human being on the moon. -
First space shuttle flight
The first space shuttle flight hosted by United States of America mission STS-1 and the members were John Young and Robert Crippen it came back to it's landing spot about 54 hrs. and 30 minutes later having orbited the Earth in a total of 36 times. -
The 1996 Mars pathfinder expedition
In 1996 NASA launched their first ever expedition to put a rover on Mars. The experiment was pretty cheap, faster, and better.It landed on Mars on the 4th of July in 1997 as that was the first ever thing that has been put on Mars atmosphere to see if it fits the safety requirements for humans to go up there. We are still waiting for the first human to go onto the planet Mars. -
Cassini orbiter
For decades Nasa's Cassini orbiter has been studying and observing Saturn so it could tell NASA all about Saturn and it's icy moons and methane rivers which flow into methane seas which has been observed by the orbiter. -
Neil Armstrong
Neil Armstrong was an American astronaut ,pilot, and an engineer he is an American symbol for being the first ever human being to be on/walk on the moon with Buzz Aldrin and Michael Collins and Armstrong said words that have been heard all around the world when he stepped on the moon "One small step for man, one giant leap for mankind." He and his crew than landed Apollo 11 when coming back from the moon. -
John Glenn
John Glenn lived in 1921-2016 and was an American astronaut and senator he was the first American to orbit the Earth circling it three times in 1962 and after his retirement from NASA he served as a Democratic senator in Ohio in the years 1974 to 1999 and he previously died because of old age at the age 95. -
Refracting vs. reflecting telescopes
The difference between reflecting and refracting telescopes is that a reflector telescope uses two mirrors instead of two lenses developed by Isaac Newton to combat chromatic aberration [A rainbow seen around some objects with a refractor telescope. -
Lucy mission
The Lucy mission is a spacecraft that will go and study and observe 5 of Jupiter trojans, they are asteroids that share the orbit with Jupiter and it will launch in October 2021 and will last 12 years in Jupiter's atmosphere it will each be drive by's when studying the trojans.
