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      Question

      Distances to the observed neutral hydrogen atoms must be

      __________ on the basis of measured velocities used in conjunction with a rotation curve for the Galaxy, which can be built up from measurements made at different galactic longitudes.
      A Estimated Correct Answer Incorrect Answer
      B Enervated Correct Answer Incorrect Answer
      C Intimated Correct Answer Incorrect Answer
      D Intimidated Correct Answer Incorrect Answer
      E None of the above Correct Answer Incorrect Answer

      Solution

      The sentence talks about distance to be assumed on the basis of a certain unit. Hence the word โ€˜estimatedโ€™ fits the sentence where it means to assume a numerical value based on present knowledge or factors.

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