What Factor Has Seriously Reduced the Effectiveness Over the Last

question 345

Multiple Choice

What factor has seriously reduced the effectiveness over the last few years of the 5-m Hale telescope on Mt.Palomar,California,formerly the largest telescope in the world?

• A) light pollution from nearby cities
• B) cracking of the mirror by the Los Angeles earthquake
• C) distortion of the mirror surface from repeated exposure to the cold night air on the mountain
• D) tarnishing of the mirror surface by air pollution

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