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322 BCE
aristotle
He believed that the earth was the center of our universe, he correctly summarized that the earth was a perfect sphere he believed this because the shadow of the earth during a lunar eclipse. -
168
ptolemy
He believed that the Earth was the center of the Universe. he was able to combine what he saw of the stars' movements with mathematics, especially geometry, to predict the movements of the planets. -
1543
Copernicus
He had the idea that the sun was our center of the universe, he had the first idea that the earth rotates on its axis most people didn't accept this theory (people only used parts of his theory.) -
Tycho brahe
Tycho was one of the individuals whose work helped overturn that belief in favor of a heliocentric model of the universe, with the sun at the center. he also personally believed that the earth was motionless and at the center of our universe. -
The Difference between a refracting and reflecting
A reflector telescope uses two mirrors instead of two lenses. Isaac Newton developed this telescope to combat chromatic aberration. a reflecting telescope is a telescope that the light from an object enters the telescope tube and is reflected off a curved mirror at the end of the tube. -
Hans lippershey
He is commonly associated with the invention of the telescope, because he was the first one who tried to obtain a patent for it. This lead to a lot of discoveries associated with things not available to the human eye, like the discovery of the craters on the moon. -
Johannes Kepler
Johannes Kepler is an astronomer who discovered three major laws of planetary motion, 1) the planets move in elliptical orbits with the Sun at one focus 2) the time necessary to traverse any arc of a planetary orbit is proportional to the area of the sector between the central body and that arc 3) there is an exact relationship between the squares of the planets’ periodic times and the cubes of the radii of their orbits. -
galileo
Galileo was actually the first to discover that the moon had craters in it. He discovered sun spots. He tracked the stages of Venus. he is perhaps most known for his discovery of the four most massive moons of Jupiter. -
Giovanni Cassini
one of Giovanni Cassini's main discoveries was the discovery of the gaps in Saturn's rings and four of its largest moons for which he is most remembered. -
Sir Issac newton
Issac contributed lots to astronomy in his life time, he invented calculus and provided a clear understanding of optics. But one thing he was mainly known for is his work on forces and especially his work on the development of gravity. -
William Herschel
William discovered Uranus, he hypothesized that nebulae are composed of stars, and he developed a theory of stellar revolution. -
Percival Lowell
Percival predicted the existence of a planet beyond the orbit of Neptune and initiated the search that ended in the discovery of Pluto. -
Karl Jansky
Karl first discovered radio waves emanating from the milky way, He is considered one of the founding figures of radio astronomy. -
Edwin Hubble
Edwin's studies of spiral nebulae proved the existence of galaxies other than our own Milky Way. He also discovered that many objects previously thought to be clouds of dust and gas were actually galaxies out of the milky way. -
Albert Einstein
Einstein was a theoretical physicist who developed the theory of relativity, one of the two pillars of modern physics. His work is also known for its influence on the philosophy of science -
Sputnik
Sputnik was the words first artificial satellite, it proved that humans could live and work in space, Eight years later, Apollo 11 landed astronauts on the moon thanks to this satellite. -
John Glenn
John was one of the Mercury Seven, military test pilots selected in 1959 by NASA as the nation's first astronauts, he flew the Friendship 7 mission, becoming the first American to orbit the Earth -
Ejnar Hertzsprug
Ejnar classified types of stars by relating their color to their absolute brightness, an accomplishment of fundamental importance to modern astronomy. -
Yuri Gagarin
Yuri was the first man to go into space it lasted lasted 108 minutes as he circled the Earth for a little more than one orbit in the Soviet Union's Vostok spacecraft. -
Neil Armstrong
Armstrong was the first man to successfully take a step on the moon ( July 20, 1969) -
The Apollo Program
The Apollo was the NASA program that resulted in American astronauts' making a total of 11 spaceflights and walking on the moon. -
the first space shuttle flight
STS-1 (Space Transportation System-1) was the first orbital spaceflight of NASA's Space Shuttle program.1,728,000 kilometers,and 36 full orbits. -
Mars pathfinder Expedition
Mars Pathfinder. Mars Pathfinder was launched December 4, 1996 and landed on Mars' on July 4, 1997. It was designed as a technology demonstration of a new way to deliver an instrumented lander and the first-ever robotic rover to the surface of the red planet. -
Casini Orbiter
The Casini Orbiter was a collaboration between NASA, the European Space Agency, and the Italian Space Agency to send a probe to study the planet Saturn and its system, including its rings and natural satellites.
