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Q25: Emission spectra from interstellar gas clouds glow
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Q58: In our solar system, which of these
Q63: Compared with the 2.5-m diameter Mount Wilson
Q116: An astronomer, examining two photographs of a
Q123: The radio station has a broadcast frequency
Q199: In which one of these ranges of
Q215: The highlands ringing Mare Imbrium are a
Q278: Earth's magnetosphere is the<br>A) region beyond Earth's
Q286: Spacecraft exploring the Moon in the 1990s