-
322 BCE
Aristotle
384 to 322-Proved that the Earth was spherical, also believed that the Earth was in the center of universe, and thought the Sun, moon, stars and all of the planets were attached to their own sphericals that moved. -
120 BCE
Hipparchus
190 to 120 BC-A Greek astronomer, geographer, and mathematician. He is considered the founder of trigonometry but is mostly famous for his discovery of precession of the equinox and solstices, and calculated the length of a year. He also calculated the distance between the Earth and the Moon and made the first catalog of he stars. -
170
Ptolemy
100 to 170-He believed that the Earth is the center of the universe. The word for earth in Greek is geo, so we call this idea a "geocentric" theory. He wrote a book called Almagest. -
1543
copernicus
1473 to 1543- He is best known for the first astronomer to post the idea of heliocentric solar system—a system in which the planets and planetary objects orbit the sun. Also believed that the Earth spinned on its own axis daily, and is invented the scientific method -
Tycho Brahe
1546 to 1601- Supported the theory of the Solar System. Made some of the most accurate observations of planetary positions which would eventually prove useful to his predecessors. -
Hans Lippershey
1570 to 1619-He is commonly associated with the invention of the telescope, because he was the first one who tried to obtain a patent for it. He reported the invention to Galileo.His magnification is 3x magnification. -
Jahannes Keppler
1571 to 1630- He is a German astronomer who discovered three major laws of planetary motion.Was Brahe´s assistance. All planets move in elliptical orbits, with the sun at one focus. -
Galileo
1564 to 1642-He was the first to see craters on the moon, he discovered sunspots, and he tracked the phases of Venus.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.Also turned a toy into a telescope. -
Giovanni Cassini
1625 to 1712- Discovered the divisions of Saturn's ring and was the first person to observe the moons of Saturn. -
Reflecting Telescope
1727- A reflecting telescope is a telescope that uses a single or combination of curved mirrors that reflect light and form an image. -
Sir Isaac Newton
1643 to 1727- Further developed works of Copernicus and Kepler using math. Invented the reflecting telescope, it is a telescope that refracts the image and the light. -
Refracting Telescope
A refracting telescope is a type of optical telescope that uses a lens as its objective to form an image. -
William Herschel
1738 to 1822-He found the planet Uranus and its two moons, and formulated a theory of stellar evolution. In 1800, he performed a simple experiment determining the temperature of the different colors of sunlight passed through a prism. He noticed the region just beyond the red color was even higher than light in the visible spectrum, and used his measurement to deduce the presence the presence of what is now known to be infrared radiation. -
Percival Lowell
1855 to 1916- who predicted the existence of a planet beyond the orbit of Neptune and initiated the search that ended in the discovery of Pluto. -
Karl Jansky
1905 to 1950- Discovered the radio waves are emanating from space.Radio waves are the longest type of energy waves. -
Edwin Hubble
1889 to 1953-Using the color of the stars,discovered the universe is expanding. Hubble’s Law, galaxies are moving away from each other. The idea is the basis of the Big Bang Theory of how the universe began. -
Albert Einstein
1879 to 1955- Theory of Relativity (1905) and gravitation -
Sputnik
1957-Oct 4 The importance of Sputnik to the U.S. In the midst of the Cold War, Russia was successful in launching the first satellite into space to orbit Earth. Putting the Soviet Union ahead of the United States. Science and space travel became a new priority for the U.S. and the educational system. In 1958 President Dwight Eisenhower created NASA (National Aeronautics and Space Admin. The Space Race. -
Ejnar Hertzsprung
1873 to 1967- who classified types of stars by relating their color to their absolute brightness—an accomplishment of fundamental importance to modern astronomy. -
Yuri Gagarin
1934 to 1968- First human (Soviet) to orbit Earth -
Apollo Missions
1963 to 1973-The Apollo program was designed to land humans on the Moon and bring them safely back to Earth. Six of the missions (Apollos 11, 12, 14, 15, 16, and 17) achieved this goal. Apollos 7 and 9 were Earth orbiting missions to test the Command and Lunar Modules, and did not return lunar data. -
First space shuttle flight
April 12 1981- when the orbiter Columbia, with two crew members, astronauts John W. Young, commander, and Robert L. Crippen, pilot, lifted off from Pad A, Launch Complex 39, at the Kennedy Space Center. -
Mars Pathfinder Expedition
1996-is an American robotic spacecraft that landed a base station with a roving probe on Mars in 1997. This mission was the first of a series of missions to Mars that included rovers, and was the first successful lander since the two Vikings landed on the red planet in 1976. -
Neil Armstrong
1921 to 2016- First man to walk on the Moon -
John Glenn
1921 to 2016- 1st U.S. Citizen to orbit Earth -
Cassini Orbiter
1997 to 2017- The Cassini–Huygens mission, commonly 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. -
Spacex Falcon Heavy
2018- Falcon Heavy is a partially-reusable heavy-lift launch vehicle designed and manufactured by SpaceX.
