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In 613 BC Chinas annals record a great comet this was the first known sighting of Hallleys Comet and perhaps one of the earliest records of a comet
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Tycho Brahe mearsures the position of a great comet and compares it with sightings from other places in Earth ,proving that its roughly 4 times further from the moon.
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the first asteroid was discovered, it was named Ceres ut was duscivered by an italian astronomer Giovanni Piazza
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an airbust happens and flattens trees
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Luis Alvarez discovers that a massive asteroid is what led to the extinction of dinosaurs
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spacewatch survye starts up at the university of arizona led by gehrels
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US congress appointed panel proposes spaceguard program to search for all near earth asteroids larger than 1 kilometer across within 10 years
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a space program was a created to search for nearby asteroids that were considered a threat
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comet named shoemaker-levy 9 is discovered, it looks like a string of pearls.this comet crashed into jupiter,
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the NEAT ( near earth asteriud tracking) project started and more asteroids began to get discovered
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The Torino Scale is published by astronomer Rick Binzel. to calm people of public fears
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an asteroid was discovered that had the highest possibility of impact
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the Yarkosvky Effect was discovered this was known to be able to move asteroids and prevent collison
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Nasas spacecraft stardust was the first to get into a collisioin with a comet
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their spcacecraft returns with a samples of comet dust
