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1473 BCE
Copernicus
(1473-1543 A.D.)He formulated a model of the universe that placed the Sun rather than the Earth at the center of the Earth. He also said the Sun revolves around the Earth. -
384 BCE
Aristotle
(384-322 B.C., Greek)According to Aristotle the Sun, Moon, the planets, and the stars travel in seperate spheres. The great philosopher proved the earth is spherical. He also believed earth was the center of the universe and the earth was round. -
190 BCE
Hipparchus
(190-120 B.C.)A greek astronomer,geographer, and mathematician. The founder of trigonometry and discovered of precession of the equinoxes and solstice. Calculated the length of one year. He also calculated the distance between the earth and the moon. Came up with the first catalogue of stars. -
100
Ptolemy
(100-170 A.D.)A poet of a single epigram in the Anthology. Believed earth was the center of the universe. Geo means earth in Greek. Wrote book called Almagest. -
1546
Tycho Brahe
(1546-1601 A.D.)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. -
1564
Galileo
(1564-1642 A.D.)Galileo is a central figure in the transition from natural philosophy to modern science and in the transformation of the scientific Renaissance into a scientific revolution. He invented the “spyglass”. Discovered sunspots( darker spots on suns) The name of the moons are Europa, Ganymede, Io, and Callisto. -
1570
Hans Lippershey
(1570-1619 A.D.)He is commonly associated with the invention of the telescope, because he was the first one who tried to obtain a patent for it. -
1571
Johann Kepler
(1571-1630 A.D.)Johannes Kepler was a German mathematician, astronomer, and astrologer. Kepler is a key figure in the 17th-century scientific revolution. Brahe's assistant -
Refracting Telescope
(1608 A.D.)A refracting telescope is a type of optical telescope that uses a lens as its objective to form an image. The refracting telescope design was originally used in spy glasses and astronomical telescopes but is also used for long focus camera lenses. Sir Isaac Newton invented the Refracting Telescope. -
Giovanni Cassini
(1625-1712 A.D.)He was the first to observe the shadows of Jupiter's satellites as they passed between that planet and the sun. He discovered the division of the rings of Saturn. -
Sir Isaac Newton
(1643-1727 A.D.)He further developed works of Copernicus and Kepler using math. He is credited as one of the great minds of the 17th century.He invented the reflecting telescope in 1668. He also made the 3 laws of Motion. He is mainly known for all of his gravity work. -
Reflecting Telescope
(1668 A.D.)A reflecting telescope is a telescope that uses a single or combination of curved mirrors that reflect light and form an image. It was invented in 1668 by Sir Isaac Newton. -
William Herschel
(1738-1822 A.D.) William is the founder of sidereal astronomy for the systematic observation of the heavens. He was the one that found Uranus. He hypothesized that nebulae are composed of stars, and developed a theory of stellar evolution. This man was knighted in 1816. He used a prism and thermometers in his experiment that eventually led to the discovery of the infrared region of the electromagnetic region. -
Percival Lowell
(1855-1916 A.D.)This guy predicted the existence of a planet beyond the orbit of Neptune and initiated the search that ended in the discovery of Pluto. -
Ejnar Hertzsprung
(1873-1967 A.D.)Danish astronomer who classified types of stars by relating their color to their absolute brightness an accomplishment of fundamental importance to modern astronomy. -
Albert Einstein
(1879-1955 A.D.)cited as one of the most influential scientists of the 20th century. His work helps astronomers study everything from gravitational waves to Mercury's orbit. His equation that helped explain special relativity E = mc2 is famous even among those who don't understand the underlying physics. -
Edwin Hubble
(1889-1953 A.D.) He played a crucial role in establishing the fields of extra galactic astronomy and observational cosmology and is regarded as one of the most important astronomers of all time. -
Karl Jansky
(1905-1950 A.D.)Karl Jansky was an American physicist and radio engineer who in August 1931 first discovered radio waves emanating from the Milky Way. He is considered one of the founding figures of radio astronomy. -
John Glenn
(1921-2016 A.D.)Colonel John Herschel Glenn Jr. was a United States Marine Corps aviator, engineer, astronaut, and United States Senator from Ohio. In 1962, he became the first American to orbit the Earth, circling it three times. -
Neil Armstrong
(1930-2012 A.D.)Neil Alden Armstrong was an American astronaut, engineer, and the first person to walk on the Moon. He was also an aerospace engineer, naval aviator, test pilot, and university professor. -
Yuri Gagarin
(1934-1968 A.D.)Yuri Alekseyevich Gagarin was a Soviet pilot and cosmonaut. He was the first human to journey into outer space when his Vostok spacecraft completed an orbit of the Earth on 12 April 1961. -
Sputnik
(1957 A.D.)Sputnik 1 was the first artificial Earth satellite. The Soviet Union launched it into an elliptical low Earth orbit on 4 October 1957. It was a 58 cm diameter metal sphere, with four external radio antennas to broadcast radio pulses. -
Apollo Missions
(1963-1972 A.D.)There were many Apollo missions. There are 6 missions. Such as Apollo 11, 12, 14, 15, 16, and 17. They were all a mission to go to the moon. -
First Space Shuttle Flight
(1981 A.D.)The first Space Shuttle Flight was April 12, 1981. The people in the flight are astronauts John W. Young, commander, and Robert L. Crippen. -
Mars Pathfinder Expedition
(1997 A.D.)The Mars Pathfinder mission was an important first step in rovers for NASA. The 1997 mission included the first successful rover on Mars, called Sojourner, which was delivered to the surface by the Pathfinder lander. -
Cassini Orbiter
(1997-2017 A.D.)The Cassini Huygens mission, called Cassini, 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. -
Space X Falcon Heavy
(2018 A. D.)Falcon Heavy is a partially-reusable heavy-lift launch vehicle designed and manufactured by SpaceX. It is derived from the Falcon 9 vehicle and consists of a strengthened Falcon 9.
