All large astronomical telescopes built since the start of the 20th century have been _______________ telescopes.
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Q42: What must be used to maintain the
Q43: Match the name of the telescope to
Q44: What are the three factors which can
Q45: What technique often requires the use of
Q46: Optical telescopes are intended for the study
Q48: Why aren't optical or radio telescopes used
Q49: Light-gathering power is proportional to the _
Q50: Explain the difference between cosmic rays and
Q51: The Chandra observatory uses _ mirrors in
Q52: Why do large reflecting telescopes, like the
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