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 Albert Einstein's theory that posits, among other things, the equivalence of mass and energy.
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Questions about the "Goldilocks Zone" around a parent star where conditions are just right for the potential of life developing.
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Questions regarding the material at or near the center of an astronomical object.
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Questions related to techniques and equipment related to amateur to professional astronomical photography.
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Questions regarding the large "cloud" of small bodies that forms a sphere around the solar system.
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Questions regarding the former 9th (now dwarf) planet Pluto.
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Questions regarding the physical dimensions of a celestial object.
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Questions about the outermost layer of a body.
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Questions about the observed frequency range of the electromagnetic radiation of a celestrial object.
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Questions about reflecting telescopes using a concave primary mirror and a flat diagonal secondary mirror.
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A collection of ionized gases and dust in interstellar space
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Questions related to earth processes or related processes and principles.
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Questions regarding gravitationally bound systems of hundreds to thousands of galaxies as well as interactions between such systems.
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Questions about spacecraft journeying to other stellar systems.
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Questions regarding the space or objects outside of galaxies.
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Questions about the gas that lays between stars in galaxies.
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Questions regarding the Hubble space telescope, a scientific telescope on a satellite orbiting Earth.
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Questions about patterns formed by group of prominent stars in the night sky.