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
H And K Lines
The strongest lines in the visible spectrum of ionized calcium, lying in the violet at wavelengths of 393.4 and 396.8 nanometres. They are conspicuous features in the spectra of many stars, including the Sun. The designations H and K were given by Fraunhofer and are still commonly used. See also: Fraunhofer lines.