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Which method relies on the mass of a dark object revealing its presence?
Q18: What term refers to accumulated knowledge that
Q24: From studies of the masses of individual
Q26: Most astronomers believe that the stars in
Q41: Almost all active galactic nuclei seem to
Q41: How is a talent turned into a
Q43: What is the Great Wall?<br>A) It is
Q49: The Big Bang was an expansion of
Q60: What are two differences observed between Type
Q61: The numbers of sunspots and their activity
Q69: An intermediately wound barred spiral galaxy would