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Motion of the planets was explained with his theory of gravity.
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Discovered Uranus, made hypothesis that nebulae are composed of stars and theory of stellar evolution
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Published his nebular hypothesis, arguing that the planets formed from a mass of incandescent gas.
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Discovered canals and oasis on Mars
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Devised a north-polar system to determine a star's magnitude.
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Researched on planet Jupiter, proposed theory of dark matter and came up with the concept of the de Sitter space and de Sitter universe, a solution for where there is no matter.
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Showed that time does not pass at the same speed everywhere and predicted existence of black holes.
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Deduced that the Sun lies near the central plane of the Galaxy, found pulsating stars.
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Suggested that our galaxy is one of billions and that the universe is expanding.
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He was the person to propose the theory of the expansion of the universe.
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British Astronomer who was known for his contribution to the theory of stellar nucleosynthesis. He also made the phrase 'Big Bang'.
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Discovered a cosmic microwave background radiation.
