What factor has seriously reduced the effectiveness over the last few years of the 5-m Hale telescope on Mount 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

Question

Quizplus · Accepted Answer

Light pollution from nearby cities has significantly reduced the effectiveness of the Hale Telescope by increasing the background light, which makes it more difficult to observe faint astronomical objects.

What Factor Has Seriously Reduced the Effectiveness Over the Last