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Aristotle was a notable astronomer from the third century BC. He thought the earth is the center of the universe and the sun and other planets were all around it.
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He was a mathematician and astronomer who proposed that the sun was stationary in the center of the universe and the earth revolved around it.
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He did construct his own improved design and was the first to used one to look at the stars. He shown how the planets have their own satellites.
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He discovered the laws of gravity and motion and invented calculus. His laws of motion and theory of gravity support much of modern physics and engineering.
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The Space Race was an informal 20th-century competition between the Soviet Union (USSR) and the United States (US) to achieve firsts in spaceflight capability.
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Less than two years after Laika disappear while orbiting the Earth, two monkeys, Able and Baker, became the first living beings to return to our planet alive.
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Yuri Gagarin became the first human to fly into space and return to Earth safely.
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American astronauts Neil Armstrong and Buzz Aldrin became the first humans to set foot on a celestial entity other than Earth.
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NASA's shuttle Columbia became the first winged spaceship to orbit Earth and return to airport landing.
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Dennis Tito, a millionaire businessman from California, became the first paying passenger to travel into outer space. He payed $20 million for the privilege.
