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 about the "adulthood" of stars. The main sequence is a distinctive band of stars that appears in a color-magnitude plot (known as Hertzsprung-Russell diagram). Stars appear in the main seque…
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Questions regarding Mars, the fourth planet from the sun.
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Questions involving the property of astronomical objects that determines their inertial resistance and gravitational interaction with other bodies.
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Questions about Mercury, the first planet from Earth'd sun. Also the smallest major planet in the Solar System,
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Questions on objects passing through the atmosphere which leave visible wakes of incandescent material.
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Questions regarding the Milky Way Galaxy, the galaxy that Earth's solar system is in.
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Questions regarding Luna, Earth's moon and only natural satellite.
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Questions regarding the process of assigning an identifying set of characters to an astronomical object.
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Questions regarding the National Aeronautics and Space Administration, the American civilian space agency.
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Questions on celestial bodies that orbit planets.
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Questions regarding the process of accurately finding your location, and getting to another place by planning and following a map.
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A collection of ionized gases and dust in interstellar space
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Questions regarding Neptune, the 8th and furthest major planet orbiting Earth's sun.
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Questions regarding a family of extremely low-mass, electrically neutral particles described in the Standard Model of particle physics.
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mainly composed of neutrons.
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Questions about reflecting telescopes using a concave primary mirror and a flat diagonal secondary mirror.
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Questions regarding the action or process of observing a single object carefully to glean information.