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Q12: Why do astronomers conclude that quasars are
Q18: One of the factors that a large
Q23: An astronomer records the spectrum of light
Q25: The type of radiation that is emitted
Q32: The solar wind extends to the _
Q33: Spiral galaxies are mostly found _.<br>A) in
Q39: Globular clusters have approximately how many stars?<br>A)
Q50: Objects used to map spiral arms are
Q51: The Hubble law is one of the
Q55: The main energy source that drives a