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Aristotle was alive from 384 to 322 BCE. He lived and was from Greece, and was a greek philosopher. Aristotle thought that the solar system was geocentric. And that means, he thought that, Earth was in the center of the solar system and other plants surrounded Earth.

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Aristarchus was alive from 310 to 250 BCE. He also lived and was from Greece, and was a greek astronomer and mathematician. Aristarchus thought that the solar system was heliocentric. And that also means that he thought that the sun was in the center of the solar system and all the planets surrounded the sun. He did try and make a model of the solar system, but nobody accepted his model. But Aristarchus did make a major contribution to science and then tried to measure the distance of the moon between the sun.

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Ptolemy was alive from 100 to 170 BCE. He lived and was from Alexandria, Egypt (as it was apart of ancient Rome). Ptolemy was an astonomer, geographer, and mathematician. Ptolemy was and is known for his book, based on observations of the plants, about 800 years ago. He then made a geometric scale that was sed by asrtonomers- he used the 'wheels on wheels' system and which helped him predict the motion of years, later in the future.

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Copernicus's full name was Nicolaus Copernicus. He was alive from 1473 to 1543. He lived and was from Polin- as he was a polish astonomer. He made the first heliocentric designed model of the solar system and used the 'wheels on wheels' system, just like Ptolemy.

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Galileo's full name was Galileo Galilei. He was alive from 1564 to 1642. Galileo was a scientist who made up questions in the topic of scientific methods. He made many improvments to the newly invented telescope. He also loved to observe the planets.

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Kepe's full name was Johannes Kepler. He was alive from 1571 to 1630. He was from and lives in Germany, therefore he was a gemran mathematician and astronomer. He also made three principles, which today are known as 'Kepler's Law'.

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We remember these thinkers 2000 yeas later because they helped find out where we live and what exactly our solar system basically is. And it really helped the people associating with our solar system now improve amd know the things they already know.