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322 BCE
Aristotle
he beleaved Sun, Moon, stars, and planets all orbited Earth. The geocentric model served as the predominant description of the cosmos in many ancient civilizations, such as those of Aristotle -
168 BCE
Ptolemy
the Sun, Moon, stars, and planets all orbited Earth. The geocentric model served as the predominant description of the cosmos in many ancient civilizations, such as those of Aristotle -
1543
Copernicus
Nicolaus Copernicus proposed that the planets instead revolved around the sun. Although his model wasn't completely correct, it formed a strong foundation for future scientists to build on -
Tycho Brahe
making and recording accurate astronomical observations—had already been done at Uraniborg. To his earlier observations, particularly his proof that the nova of 1572 was a star, he added a comprehensive study of the solar system -
Hans Lippershey
many historians believe he was the inventor of the first telescope and is also sometimes credited with the invention of the compound microscope -
Johannnes Kepler
1609 he published Astronomia Nova, delineating his discoveries, which are now called Kepler's first two laws of planetary motion. And what is just as important about this work. A fundamental law of nature. Today we call this the scientific method. -
Galileo
Of all of his telescope discoveries, he is perhaps most known for his discovery of the four most massive moons of Jupiter, now known as the Galilean moons: Io, Ganymede, Europa and Callisto. When NASA sent a mission to Jupiter in the 1990s, it was called Galileo in honor of the famed astronomer. -
What Is The Difference between refracting and reflecting telescopes
A reflector telescope uses two mirrors instead of two lenses. When you refract the light changes direction. -
Giovanni Cassini
Astronomer Giovanni Cassini is associated with a number of scientific discoveries and projects, including the first observations of Saturn's moons. -
Sir Isaac Newton
his most significant work had to do with forces, and specifically with the development of a universal law of gravity -
William Herschel
credited as the founder of sidereal astronomy for observing the heavenly bodies. He found the planet Uranus and its two moons, and formulated a theory of stellar evolution. -
Karl Jansky
He built an antenna, pictured here, designed to receive radio waves at a frequency of 20.5 MHz. It was mounted on a turntable that allowed it to rotate in any direction, earning it the name "Jansky's merry-go-round". By rotating the antenna, one could find what the direction was to any radio signal. -
Albert Einstein
His equation that helped explain special relativity – E = mc2 – is famous even among those who don't understand the underlying physics. -
Sputnik
The Sputnik rocket was an orbital carrier rocket designed by Sergei Korolev in the Soviet Union, derived from the R-7 Semyorka ICBM. On 4 Oct 1957 it was used to perform the world's first satellite launch placing Sputnik 1 into a low orbit. -
Yuri Gagarin
Yuri Gagarin was the first person to fly in space. His flight, on April 12, 1961, lasted 108 minutes -
John Glenn
distinguished war hero, the first American to orbit the earth, state senator and the oldest person to go into space. -
Ejnar Hertzsprung
he was astronomer who classified types of stars by relating their colour to their absolute brightness—an accomplishment of fundamental importance to modern astronomy. The Hertzsprung-Russell diagram of stellar types was named (in part) for him. -
The Apollo Program
The Apollo program was designed to land humans on the Moon and bring them safely back to Earth. -
First Space Shuttle Flight
The first launch of the Space Shuttle occurred on 12 April 1981, exactly 20 years after the first manned space flight. When the orbiter Columbia, with two crew members. -
Neil Armstrong
the first man to walk on the moon -
Edwin Hubble
worked at the Mount Wilson Observatory in California, he started working there. he also found out we are in the milky way -
Mars Pathfinder Expedition
Mars Pathfinder was launched December 4, 1996 and landed on Mars on July 4, 1997. It was designed as a technology look at a new way to deliver an instrumented lander and the first-ever robotic rover to the surface of Mars -
Cassini Orbiter
The Cassini spacecraft orbited Saturn from June 30, 2004, until Sept. 15, 2017, when the probe ended its life with a plunge into the ringed planet's atmosphere. -
New Horizons latest images from Ultima Thule reveal new details
Just after midnight on New Year’s Day, NASA’s New Horizon’s spacecraft flew past the Kuiper Belt object.
