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apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun aphelion
comet, point farthest from sun in orbit of aphelion
(astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed coma
comet head, cloud around nucleus of coma
English astronomer who used Newton's laws of motion to predict the period of a comet (1656-1742) Edmond Halley , Edmund Halley , Halley
United States astronomer (born in the Netherlands) who studied the solar system and suggested in 1951 that there is a belt of comet-like debris at the edge of the solar system (1905-1973) Gerard Kuiper , Gerard Peter Kuiper , Kuiper
(astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail nucleus
comet head center nucleus
(astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto; perturbations (as by other stars) can upset a comet's orbit and may send it tumbling toward the sun Oort cloud
periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun perihelion
comet, point nearest sun in orbit of perihelion
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