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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Questions related to the most massive examples of black holes that typically reside at the centers of galaxies.
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Questions regarding stars which increase suddenly in energy output due to an explosion which ejected much of its mass.
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Questions about the outermost layer of a body.
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Questions related to the physical instruments for astronomical observations.
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a planet that has a compact rocky surface like the Earth's; the four innermost planets in the solar system.
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Questions about Titan, the largest moon of Saturn.
any minor planet in the Solar System that orbits the Sun at a greater average distance (semi-major axis) than Neptune.
A map of the surface features of something.
Questions regarding Triton, the largest moon of Neptune.
Questions about Trojan Asteroids, asteroids that co-orbit major planets.
Questions about flow regime in astrophysical gas characterized by chaotic properties.
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Questions regarding the space in which all mass is thought to exist.
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Questions regarding Uranus, the 7th planet from Earth's sun.
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Questions regarding the planet Venus, the second planet from Earth's sun.
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Questions about the water molecule (composed of two atoms of hydrodgen and one atom of oxygen) and its detection in celestial objects.
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Questions regarding atmospheric conditions on either Earth or on other planets.
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Questions regarding a theoretical 'tunnel' through spacetime which could potentially allow time travel.