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construct a timeline of galileo's life.
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1564 - born in pisa, italy
1589 - appointed chair of mathematics at university of pisa
1591 - travels to rome to present his discoveries
1609 - invents telescope, begins observing the night sky
1610 - publishes starry messenger 
1633 - tried by roman inquisition, forced to recant his discoveries
1642 - dies in exile in arcetri
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