 The Earth's atmosphere blurs objects in terrestial telescopes, while telescopes used in space tend to show a clearer image. The magnification of an object is determined by the focal length of the primary lens or mirror of the telescope, divided by the focal length of the eyepiece. |
| There are two types of mountings for a telescope: an altazimuth mount, which allows the telescope to move up, down, and sideways, but not diagonally; and equatorial mount, which allows the telescope to spin in every direction. |
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