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384 BCE
Aristotle popularized idea of a geocentric world.
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. -
1473
Nicolaus Copernicus claimed that the sun was the true center of the universe.
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. -
Galileo Galilei was recognized as the father of physics and modern science.
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. -
Isaac Newton discovered gravity. He developed calculus and three laws of motion.
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. -
The space race between two Cold War rivals
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. -
First creatures return from space
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. -
Yuri Gagarin
Yuri Gagarin became the first human to fly into space and return to Earth safely. -
Men walk on moon.
American astronauts Neil Armstrong and Buzz Aldrin became the first humans to set foot on a celestial entity other than Earth. -
Space shuttle takes off.
NASA's shuttle Columbia became the first winged spaceship to orbit Earth and return to airport landing. -
First space tourist.
Dennis Tito, a millionaire businessman from California, became the first paying passenger to travel into outer space. He payed $20 million for the privilege.
