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Iran launches a satellite into orbit on an Iranian-built rocket

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The International Astronomical Union demotes Pluto to the new category of 'dwarf planet'

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Juno, a solar-powered spacecraft, is launched from Cape Canaveral on a mission to Jupiter

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Three US astronauts become the first humans to leave the earth's orbit, reaching the moon and going into its orbit in Apollo 8

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A comet returns exactly at the time predicted by English astronomer Edmond Halley, and is subsequently known by his name
1769 | Capt

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The Hubble Space Telescope is launched from a space shuttle and goes into orbit 370 miles (600 km) above the earth

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Soviet spacecraft Luna 1 goes into orbit round the sun, between the orbits of Earth and Mars

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Soviet cosmonaut Aleksei Leonov is the first to walk in space, moving round outside the Voshkod 2 spacecraft for more than ten minutes

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Giovanni Domenico Cassini, working in the Paris royal observatory, calculates the distance from the earth to the sun and is only 7% out

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A comet intrigues Edmund Halley, who works out that it has been around before

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US astronomer Edwin Hubble proves that the nebula Andromeda is vastly further away than other stars and can only be a separate galaxy

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Wealthy US astronomer Percival Lowell builds an observatory at Mars Hill in Flagstaff, Arizona

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A comet returns exactly at the time predicted by English astronomer Edmond Halley, and is subsequently known by his name
1769 | Capt

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Galileo, with his new powerful telescope, observes the moons of Jupiter and spots moving on the surface of the sun

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A comet returns exactly at the time predicted by English astronomer Edmond Halley, and is subsequently known by his name

1769	
Capt

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Polish astronomer Nicolaus Copernicus publishes a book suggesting that the earth moves round the sun

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Danish astronomer Tycho Brahe builds Uraniborg, on the island of Hven, and makes it the world's leading observatory
15

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Julius Caesar's new calendar is introduced, at a time when its predecessor has become out of step with the seasons by three months

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Eudoxus of Cnidus proposes the concept of transparent spheres supporting the bodies visible in the heavens

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.The followers of pythagoras maintain that the earth revolves on its own axis and moves in an orbit

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We're gonna start at 500 BC. I'n 500 BC the Greeks determined that the earth was a sphere not a flat. Anno Domini calendar era became the prevalent method in Europe for naming years.

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A massive blood moon, with a lunar eclipse at the same time. This is the end of the time line and I hope you enjoyed.