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Astrobiology Glossary

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Term Definition
Quark 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.

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Quote of the Day

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.

Quiz Me

How fast do the Leonid meteorites travel when entering the atmosphere?
54,000 mph
87,000 mph
121,000 mph
156,000 mph
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Fact of the Day

In England, a stone is equal to 14 pounds, a kilogram to 2.2 pounds.

Word of the Day