hubble telescope
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Title: hubble telescope

Essay Details:

Subject: Technology
Author: Mary K
Date: December 13, 2015
Level: University
Grade: A
Length: 4 / 1116

Essay text:

After being deployed, astronomers immediately found out that the telescope could not be focused. They found the problem and discovered that the primary mirror had been ground to a wrong dimension at the Perker-Elmer Corporation's factory. Although the defect in the mirror was less than one-fifth the size of a human hair, it was enough for the Hubble Telescope to suffer from spherical aberration, light reflected from the mirror's edge gets focused to a slightly different point than light reflected from the center, and produce fuzzy, unclear images. Scientists came up with a solution to correct the defect in which they came up with a replacement "contact" lens called COSTAR...

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