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A hydrogen atom in a low-density, hot gas gives off what type of spectrum?
Q36: Two stars, A and B, have the
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Q68: The majority of the mass of ordinary
Q83: Astronomers believe that the stellar disk around
Q107: A discovery useful to telescope makers was
Q139: Atoms in a low-density, hot gas (e.g.,
Q243: High tide at any location on Earth
Q253: One major difference between radio waves and
Q269: The scientific method is a major force
Q296: Copernicus used the fact that Mars can