Space Travel
11, Feb, 2012

Space exploration began with the launch of Sputnik and Astrophysics was born as the application of physics to the phenomena observed by Astronomy, which etymologically means laws of the stars.

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Term Definition
Dall-Kirkham Telescope
A form of Cassegrain telescope in which the profile of the primary mirror is ellipsoidal rather than the more usual paraboloid. A spherical mirror is used for the secondary. The resulting field of view is considerably smaller than that of a conventional Cassegrain telescope of the same size.