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 regarding the currently prevalent cosmological model for the origin of the universe.
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gravitationally linked and orbit around their barycenter.
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Questions regarding points of extremely high mass density, which creates an extremely strong gravitational field from which light cannot escape.
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like stars but never achieve nuclear fusion because they are too low-mass.
Questions regarding Callisto, an icy moon of Jupiter.
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Questions about the dwarf planet, and the largest asteroid n the Solar System, comprising 1/3 of the mass of the asteroid belt. Ceres orbits between Mars and Jupiter.
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Questions regarding Charon, the largest satellite of the dwarf planet Pluto. Often considered to be Pluto's binary.
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Questions regarding chthonians, a hypothesised class of exoplanets that are the remnant cores of hot Jupiters.
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Questions regarding grouping objects together based on one or more shared property.
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track and display the current time.
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Questions regarding the cosmic microwave background, or CMB, the leftover radiation that is taken by many as proof of the Big Bang.
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Icy bodies that usually consist of methane, water, and other materials that originate from beyond the jovian planets, and occasionally fall into the inner solar system giving off a massive tail as mat…
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Questions about patterns formed by group of prominent stars in the night sky.
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Questions on systems to uniquely determine position of a point or other geometric element on a manifold such as Euclidean space.
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Questions regarding the material at or near the center of an astronomical object.
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Questions regarding the phenomenon in the early universe characterized by an extreme expansion of space.
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Questions about the origin, history, evolution and fate of the Universe.
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