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Ptolemy
Ptolemy theorized that Earth was the center of the universe and that the other planets and the Sun revolved around it. That is called geocentric. -
Jun 11, 1543
Copernicus
Copernicus theorized that the sun was the center of the universe and that Earth revolved around the Sun along with other planets. That is called heliocentric. -
Galileo
Galileo used the telescope to observe objects in space including carters and mountains on the moon and sunspots on the sun. -
Sputnik
Sputnik was the first artificial satelite in space launched by the Russians. -
First man to Orbit Earth
The first human to orbit Earth was Russian cosmonaut Yuri Gagarin. -
Moon Missions
Apollo II was the first mission to land people on the moon. To go to the moon NASA built the Saturn V the most powerful rocket. -
Mars robotic explorers
Spirit and Oppurtunity were two Mars robotic explorers. They have been search and collect samples so scientists can learn more about Mars. -
Aristotle
Aristotle also believed that the universe was geocentric. He theorized that the stars are other suns far away and that our Sun is much larger than Earth, it is just far away.
