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Glossary of Astronomy Terms
beginning with letter J
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Janus
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proper noun
  1. (Roman mythology) The god of gates and doorways; having two faces looking in opposite directions
  2. (astronomy) a moon of Saturn
jet stream
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noun
  1. (meteorology) any of the high-speed, high-altitude air currents that circle the Earth in a westerly direction
Jodrell Bank
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proper noun
  1. A radio observatory in England.
Jovian planet
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noun
  1. Either of the four gas giant planets in the Solar System: Jupiter, Uranus, Saturn, or Neptune.
Juno
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proper noun
  1. The Roman equivalent of the Greeks' Hera, queen of the gods.
Jupiter
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proper noun
  1. The fifth and by far the largest planet in the Solar System, a gas giant, represented by the symbol ♃ in astronomy. Jupiter is known for its Great Red Spot and many moons including the Galilean moons.
  2. The Roman King of the Gods, also called Jove. Equivalent to the Greek Zeus, Jupiter was one of the children of Saturn.
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