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324 BCE
Aristotle
Greek philosopher that proved the earth was round and believed the earth was the center of the universe. -
Period: 324 BCE to
Merseal Astro
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304 BCE
Ptlmoy
He believed that the Earth was the center of the Universe. The word for earth in Greek is geo, so we call this idea a "geocentric" theory. -
190 BCE
Hipparchus
Was considered founder of trigonometry -
1473
Copernicus
When virtually everyone believed Earth was the center of the universe, Polish scientist Nicolaus Copernicus proposed that the planets instead revolved around the sun. -
1546
Tycho Brahe
He 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. -
1570
Galileo
Galileo's observations strengthened his belief in Copernicus' theory that Earth and all other planets revolve around the Sun -
1570
Hans Lippershey
He is known with the invention of the telescope because he was the first one who tried to obtain a patent for it. -
1571
Johannes Kepler
Tycho Brahe's assistant discovered that the orbit of the planets are not circular but they are oval of astronomy and physics -
Giovanni Cassini
He discovered the division of the rings of Saturn 4 of the moons and the rotation periods of mars and Jupiter. -
Sir Isaac Newton
He invented calculus, formulated the law of gravitation and discovered the laws of motion Newton was the first person to explain tides scientifically -
Mariners Astroble
Helped to find latitude it was invisible lines on the earth showing a place or area. -
Refracting telescope
It is a type of optical telescope that uses a lens as its objective to form an image. -
Reflecting telescope
Newton's first reflecting telescope was completed and is the earliest known functional reflecting telescope. -
William Herschel
His most significant contributions to astronomy were the discoveries of several comets, including the periodic comet 35P/Herschel-Rigollet, which bears her name. -
Percival Lowell
he predicted the existence of a planet beyond the orbit of Neptune and initiated the search that ended in the discovery of Pluto. -
Ejnar Hertzsprung
he developed the Hertzsprung–Russell diagram. The HR diagram shows the correlation between the absolute brightness and the spectral type of star -
Albert Einstein
Find out about gravity, relativity and Einstein's quantum description of light -
Edwin Hubble
His meticulous studies of spiral nebulae proved the existence of galaxies other than our own Milky Way. -
Karl Jansky
He first discovered radio waves emanating from the Milky Way. Radio Waves are the longest type of energy waves. -
Sputnik
the importance of Sputnik to the US in the midst of the cold war, Russia was successful in launching the satellite into space to orbit earth. -
Yuri Gagarin
the first human to travel into space when he launched into orbit on the Vostok 3KA-3 spacecraft, first human to orbit earth -
John Glenn
He was part of the first group of astronauts NASA selected. He became the first American to orbit Earth. -
Neil Armstrong
The second was Apollo 11, which landed on the moon in 1969. First American to walk on the moon -
First Space shuttle flight
Space Shuttle program was the fourth human spaceflight program carried out by the National Aeronautics and Space Administration, which accomplished routine transportation for Earth-to-orbit -
Mars Pathfinder Expedition
Send humans to and from back safely -
Cassini Orbiter
It was a collaboration between NASA, the European Space Agency. which discovered Saturn and took seven years -
Spacex Falcon Heavy
It is a partially-reusable heavy-lift launch vehicle designed and manufactured by SpaceX.