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He thought earth was center of universe. He also thought the planets around earth were spherical. Thought moon,sun, and planets were attached to invisible shells orbiting earth.
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Wrote first star catalog. Calculated distance from earth to moon.
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He had tolemy geocentric theory.
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He formulated a model of universe to show his believe heliocentric/ sun in middle of universe.ritish Inventor of scientific steps.
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He devised the most precise instruments before telescopes.
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Invented the telescope. 3x magnification.
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Tycho brahe’s assistant. Discovered that the orbit of the planets are not circular but elliptical.
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He discovered the mountains on the moon the spots on sun and the four moons to jupiter. These helped the theory that the earth revolves around the sun. Io Europa Ganymede and Callisto.
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Discovered Saturn 4 moons and determined distance between earth and mars.
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invented reflecting telescope.
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found uranus and its two moons and founder of sidereal. Also founder of refraction.
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Predicted existence of a planet beyond orbit of neptune and initiative the search that ended in discovery of pluto.
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Discovered radio waves.
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He discovered the universe is expanding.
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Theory Relativity and gravitation.
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First satellite To orbit space.
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First person to ever orbit earth
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First American to orbit earth
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Discovered Brightness and the spectral type of star.
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First person to walk on moon.
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Sent tesla to space.
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American Robot Roaming on mars
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Went to saturn. Took 30 years.