Space Travel
10, 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
Occultation
The passage of one astronomical object directly in front of another so as to obscure it from view as seen by a particular observer. See also: grazing occultation, eclipse.