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Ptolemy describes the geocentirc model of the universe
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His first and seconedd laws of planetary od otion is anounced
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The first law of planetary motion is announced.
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is the first to take a picture of the first stellar spetrum of Vega
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he is the first to discover phobos and Deimons, the two moons of Mars
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she descover Cephied variables
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He shows that galaxies outside the Milky Way galaxy.
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uses first lquid rcket fuil
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Discovers Pluto
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HE discovers cosmic radio waves
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First radio telescope buit.
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The first man to orbit Earth
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The fist woman shuttle comander