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The method used by Hubble to determine the distance to the Andromeda Galaxy (M31) ,thereby establishing the concept of separate and individual galaxies throughout the universe,was the
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Q25: At an age of 380,000 years,the temperature
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Q53: If you weighed 180 pounds on Earth,how
Q59: In astronomical terms,planetary nebulae<br>A) exist around their
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Q123: The possible presence of a supermassive black