A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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track and display the current time.
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the group of galaxies that includes the Milky Way among others.
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Questions about gas-giant planets in very close orbit to their parent star (closer than Mercury).
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Late Heavy Bombardment; occurring between 3.7-4 billion years ago when the inner solar system underwent heavy asteroidal impacts. Also know as the Lunar Cataclysm.
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Questions about Trojan Asteroids, asteroids that co-orbit major planets.
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A map of the surface features of something.