Space Travel
23, May, 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
Multiple Star
A group of three or more stars orbiting in a system in which they are bound together by mutual gravitational attraction. A well-known example is the four-star system, Epsilon e Lyrae.