Space Travel
19, 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
Centaurus A Cen A
A radio galaxy, identified with an elliptical galaxy, NGC 5128. At a distance of 15 million light years, it is the nearest radio galaxy and consequently one of the most studied. The visible galaxy is crossed by a thick dark lane of dust. The radio-emitting lobes jut out at right angles to the dust lane, extending across 7° of sky, equivalent to almost two million light years. It is also a strong source of X-rays.