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Ptolemy was born is 100 and died in 170. He was the first to theorize that Earth is at the center of the universe. This model is called the geocentric model.
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Aristotle was born in 384 B.C.E and died in 322 B.C.E. He belived the universe was Geocentric, the same as Ptolemy. He thought that the stars we see are other suns far away and that our sun is much larger than Earth, it is also very far away.
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Copernicus was born in 1473 and died in 1543. He began to bring together information to prove the heliocentric model in 1508, as well as make it. In the heliocentric model the sun, rather than the earth, is the center of the solar system. This idea did not go very well with everyone else.
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He was born in 1564 and died in 1642. Galileo was known for astronamy, as well as inventing. He was the first person to us a telescope. He used his telescope to observe objects in space including craters, the moon, and sunspots on the Sun. He laso bleived in the heliocentric model of the the universe.
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Johannes Kepler was born in 1571 and died in 1630.He said that the planets revovle around the sun. He also theorized the laws of planetary motion that are still in play today.
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The united Stares and the Soviet Union competed with each other on who will go up to space first.
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Vanguard 1 is the first american sattelite to be launched into space. It contines to function for three years, before going out of commision.
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National Aeronautice and Space Administration, or NASA, is formed. This is the American space exploration oganization.
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Yuri Gagarin orbits the Earth once and becomes the first man in space.
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Alan B. Shepard becomes the first American in space in 1961.
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Gus Grissom is launched on a sub-orbital flight. His Liberty-Bell capsule is lost when it fills with water and sinks after splashdown.
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The Appollo missions to the moon begin. The Apollo missions were consisting of 15 missions to eventually end up on the moon. There were both crewed and uncrewed missions.
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Sputnik 1 was a Soviet Union artificial sattelite. It was also the first sattelite to enter the orbit of earth.
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The Eagle has landed. The Apollo missions were missions to get to the moon, and orbital missions. Apollo 11 was meant to get to the moon, and that is what it did. Apollo 11 made it to the moon with Neil Armstrong, Michal Collins, and Edwin "Buzz" Aldrin on July 20.
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NASA's Mars Exploration Rover Mission (MER) is an ongoing robotic space mission involving two rovers one of them being Spirit. Spirit launched on July 3, 2003, and arrived on January 3, 2004.
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NASA's Mars Exploration Rover Mission (MER) is an ongoing robotic space mission involving two rovers one of them being Opportunity. Opportunity launched on July 7, 2003 and arrived on January 24, 2004.
