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aphelion the point that is farthest from the sun in the orbit of a planet or comet.
coma2 the cloud around a comet's nucleus; the head of a comet. [2/3 definitions]
Halley's Comet a comet, last seen in 1986, that returns every seventy-six years.
Kohoutek a comet first observed in 1973 and visible into 1974.
lander one that lands, esp. a type of spacecraft that is designed to land on the surface of a planet, comet, or moon, for the purposes of retrieving or transmitting scientific data.
rover a type of vehicle designed to travel on the surface of a planet, comet, or moon, for the purpose of providing transportation or retrieving scientific data. [1/2 definitions]
tail something that resembles this appendage in position or form, such as a kite's tail, the luminous trail of a comet, or a fall of hair such as a ponytail. [1/13 definitions]