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The first telescope was invented by: Hans Lippershey
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Galilei discoveres the four largest moons on Jupiter, named Zesus: lo, Europa, Ganymede, Callisto.
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Urbain Le Verrier estimated where pluto was located in the 1840's becuas of the way Uranus rotated but, Pluto was not actually seen until the 1930's.
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The V2 rocket was created in Germany intended for weapon use during World War 2. It was the first man-made rocket to go into space.
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The first insect sent into space were fruit flies. The reasons for doing this was to see if they were going to survive in space, and if humans would. The fruit flies survived.
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Explorer 6 was a satelite created to complete many things one of the things it gave us it a photo of Earths orbit. It was from the United States.
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Yuri Gagarin was the first human to ever go into outer space and orbit the Earth. He was from Russia.
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Alexey Leonov was the first man to walk in space. He walked in space for twelve minutes. He was from Russia.
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The Luna 9 first landed on the moon this was the first landing on any other planet other then Earth.
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This mission known as Viking lander was the most expensive mission for Mars. It was a pair of American probes.
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Voyager 1 was a probe designed to study the outer solar system. This probe was working for about 37 years. It produced the first picture of the whole solar system.
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Pioneer 10 was the first spacecraft to go pass all planets. It was an American probe.
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The NEAR Shoemaker was oberated by NASA was created to study the aestroids near the Earth. The probe orbited the aestroid many times before finaly landing.
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The first orbit of Mercury was with MESSENGER it was a Mercury probe.
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The first manmade probe landed on a comet. The Rosetta soacecraft was the first spacecraft to orbit a planet.