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ほし
star; any light-emitting (or reflecting) heavenly body (except for the sun and the moon); offender; perpetrator (police slang)
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せい
Chinese "star" constellation (one of the 28 mansions); Singapore
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小惑星

しょうわくせい
asteroid
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衛星

えいせい
satellite
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惑星

わくせい
planet
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恒星

こうせい
(fixed) star (i.e. not a planet, meteorite, etc.)
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彗星

すい星
すいせい
comet
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火星

かせい
Mars (planet)
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流星

りゅうせい
meteor; falling star
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星座

せいざ
constellation; star sign; zodiac sign