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What fraction of the mass of our Galaxy is in a form that we have been able to see?
Q8: In the halo of the Galaxy,there are
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Q25: At an age of 380,000 years,the temperature
Q38: The theory of everything (TOE)would provide one
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Q56: How do you find the size of
Q89: Why does the cosmic microwave background appear
Q103: Luminosity is measured in<br>A) watts per square
Q108: If two stars of different luminosity have