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Question: using the hubble space telescope astronomers observe a distant galaxy...

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Using the Hubble Space Telescope, astronomers observe a distant galaxy similar to the Andromeda Galaxy. This distant galaxy subtends an angle of 0.150 seconds of arc. What is the approximate distance to this galaxy? Give your answer in millions of light years (i.e. mega-light-years or Mly). Assume that the Andromeda Galaxy, and hence the distant galaxy, has a diameter 150,000 ly

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