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He formulateds a helipcentric model of the universe.
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accurate and comprehensive astronomical and planetary observations
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he improved the telescope and consequent astromicalobservations and support for copernicianism
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known for his laws of planetary motion
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Cassini most notably discovered four satellites of the planet Saturn and noted the division of the rings of Saturn.
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his principia formuated the laws of motion and universal gravitation.
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he is best known for computing the orbit of the eponymous Halley's comet.
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Charles Messier published an astronomical catalouge consisting of nebulae and star clusters that are known as the 110 "Messier Objects."
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He became famous for his discovery of the planet Uranus, along with two of its major moons, Titania and Oberon, and also discovered two moons of Saturn.
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Cannon's work was important in development of contemporary stellar classification.
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He developed the general theory of relativity, one of the two pillars of modern physics.
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Hubble played a crucial role in establishing the field of extragalactoc astronomy and is generally regarded as one of the most important astronomers.
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he is best known for his contributions to the scientific research of extraterrestrial life, including experimental demonstration of the production of amino acids from basic chemicals by radiation.
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He contributed to the discovery of general relativity, and the theoretical prediction that black holes emit radiation, often called Hawking radiation. Hawking was the first to set forth a cosmology explained by a union of the general theory of relativity and quantum mechanics.
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He is most notable as one of the pioneers in the search for extraterrestrial intelligence, including the founding of SETI.
