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Which type of binary system have pairs of stars that are so close together that they look like one single point?
Q8: Spiral arms are obvious-easily-seen features-because they contain
Q9: Before a giant molecular cloud can contract
Q11: Galactic _ describes the process of a
Q11: When a large gas cloud starts to
Q13: An astronomer named _ used globular clusters
Q22: The mass of a black hole concentrated
Q25: Any compact object with a mass greater
Q42: The most common type of star is
Q48: Gas flows away from the Sun in
Q57: In the Copernican system, Earth moves slower