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Aristotle was an Ancient Greek Philosopher. He was the founder of a school Lyceum in Athens, Greece.
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Latin in full Claudius Ptolemaeus. Egyptian, astronomer, mathematician, and geographer of Greek descent.
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Polish astronomer who proposed that the planets have the sun as the fixed point to which their motions are to be referred. Wrote a manuscript called the Commentariolus.
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Developing astronomical instruments. Fixing positions of stars paved the way for future discoveries.
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Lippershey applied to States General of Netherlands for 30-year patent for instrument. States General granted Lippershey 900 florins for instrument.
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Johannes Kepler was a German astronomer who discovered three major laws of planetary motion. Planets move in orbits, time, periodic times.
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Italian natural philosopher, astronomer, and mathematician. Made fundamental contributions to sciences of motion, astronomy, and strength of materials.
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Italian-born French astronomer. Early studies were principally observations of the Sun.
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English physicist and mathematician. Original discoverer of the infinitesimal calculus.
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Founder of sidereal astronomy. Discovered the planet Uranus
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Discovered the planet Pluto. Was counselor and foreign secretary to Korean Special Mission to US.
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American engineer whose discovery of radio waves from an extraterrestrial source inaugurated the development of radio astronomy. Joined the Bell Telephone Laboratories in New Jersey.
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American astronomer who played a crucial role in establishing the field of extragalactic astronomy. Regarded as the leading observational cosmologist of the 20th century.
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Developed the special and general theories of relativity and won the Nobel Prize for Physics in 1921. Considered the most influential physicist of the 20th century.
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The first artificial Earth satellite. Soviet Union launched it into an elliptical low Earth orbit on 4 October 1957, orbiting for three weeks before batteries died, then silently for two more months before falling back into the atmosphere.
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The first U.S. astronaut to orbit Earth. He completed three orbits in 1962. He joined the U.S. Naval Reserve in 1942.
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Had no formal education in astronomy. Appointed assistant director of the university observatory at Leiden, Neth., in 1919 and became director in 1935.
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He was a Soviet pilot and cosmonaut. He became the first human to journey into outer space when his Vostok spacecraft completed one orbit of the Earth on 12 April 1961.
