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
Two-Colour Diagram
A graph on which two colour indices such as B-V and U-B are plotted, one along each axis, for a sample of stars or other objects, such as asteroids. See also: UBV photometry.