A basic building block of protons, neutrons, and other elementary particles.
Quasar
The brightest type of active galactic nucleus, believed to be powered by a supermassive black hole. The word 'quasar' is derived from quasi-stellar radio source, because this type of object was first identified as a kind of radio source. Quasars also are called quasi-stellar objects (QSOs). Thousands of quasars have been observed, all at extreme distances from our galaxy.
The historic ascent of humanity, taken as a whole, may be summarized as a succession of victories of consciousness over blind forces in nature, in society, in man himself. - Leon Trotsky (1879 - 1940), Russian revolutionary.
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How fast do the Leonid meteorites travel when entering the atmosphere?or View Results
How fast do the Leonid meteorites travel when entering the atmosphere?