英文:The branch of astronomy that deals with the planets, satellites, and meteors of the solar system.
中文:行星學天文學的一個分支,研究太陽系中的行星、衛星和流星
英文:One of the four brightest satellites of Jupiter and the eighth in distance from the planet. Originally sighted by Galileo, it is one of the largest satellites in the solar system.
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