James W. Christy
James W. Christy
1938-
American astronomer who co-discovered Pluto's moon, Charon, in 1978. Pluto, the furthest planet from the Sun, was discovered in 1930 by Clyde Tombaugh. However, because of its distance from the Sun, very little was known about it except for its orbital parameters. The discovery of Charon by Christy and Robert Harrington made it possible to determine Pluto's size and mass through application of basic physics governing planet-moon systems.
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parhelion , parhelion (astron.) mock sun. XVII. In early use par(h)elion, par(h)elius — L. parēlion — Gr parḗlion, also -ios, f. PARA-1 + hḗlios SUN.
So parasele… Aristarchus Of Samos , Aristarchus of Samos
Aristarchus of Samos
(ca. 310–230 b.c.)
mathematics, astronomy.
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Uranus was the first planet to be discovered that had not been known since antiquity. Although Uranus is just bright enough to be seen with th… Solar System , Our solar system consists of the Sun and all of its orbiting objects. These objects include the planets with their rings and moons, asteroids, comets… Phase , phase / fāz/ • n. 1. a distinct period or stage in a process of change or forming part of something's development: the final phases of the war| [as a…
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James W. Christy