Monday, September 17, 2012

Dust Tail - Definition

Dust Tail

A stream of dust particles emitted from the nucleus of a comet. It is the most visible part of a comet.

A comet tail and coma are illuminated by the Sun and may become visible from Earth when a comet passes through the inner Solar System, the dust reflecting sunlight directly and the gases glowing from ionisation. Most comets are too faint to be visible without the aid of a telescope, but a few each decade become bright enough to be visible to the naked eye.

Source: wikipedia, NASA

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