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Sometime between 13 and 20 billion years ago

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Sometime between 13 and 20 billion years ago

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The Big Bang probably occurred.

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The Greeks, including philosophers like Thales and Pythagoras, began observing and theorizing about the stars and planets.

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An astronomer named Eudoxus created the first model of a geocentric universe. Eudoxus designed his model of the universe as a series of cosmic spheres containing the stars, the sun, and the moon all built around the Earth at its center.

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The Greek astronomer Hipparchus developed the first known star catalog, documenting the positions and brightness of over 1,000 stars.

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Nicolaus Copernicus proposed the heliocentric model, suggesting that the Earth revolves around the Sun.

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Johannes Kepler discovered that the planets orbit about the Sun in an elliptical and not circular motion, and so proposed his three laws of planetary motion.

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Galileo Galilei made significant astronomical observations using his telescope, including the phases of Venus and the moons of Jupiter.

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Isaac Newton published his laws of motion and universal gravitation, revolutionizing our understanding of celestial mechanics.

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William Herschel discovered Uranus, expanding our understanding of the solar system.

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Laplace proposes the concept of Black Holes.

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Friedrich Bessel measured the first stellar parallax, providing evidence for the vast distances between stars.

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Albert Einstein formulated his theory of general relativity, which revolutionized our understanding of gravity and its effects on space and time.

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Arthur Eddington's observations during a solar eclipse confirmed Einstein's theory of general relativity.

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First radio telescope built in the USA by Grote Reber.

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The Apollo 11 mission successfully landed humans on the Moon, marking a significant milestone in space exploration.

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Voyager 1 spacecraft launched to explore the outer solar system.

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The Hubble Space Telescope was launched, capturing stunning images and revolutionizing our understanding of the universe.

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Space Shuttle Endeavor makes a detailed, global map of Earth.

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The New Horizons spacecraft flew by Pluto, providing detailed images and data about the dwarf planet.

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Astronomical research continues to thrive, with ongoing missions, discoveries, and advancements in technology.