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 n...
Found on
http://en.wikipedia.org/wiki/Comet_tail
(from the article `comet`) The tails of comets are generally directed away from the Sun. They rarely appear beyond 1.5 or 2 AU but develop rapidly with shorter heliocentric ... ...The nucleus surrounded by the coma makes up the head of the comet. When it is even closer to the Sun, solar radiation usually blows the dust of ... ...the ...
Found on
http://www.britannica.com/eb/a-z/c/115
impairment appearing as a tail following bright areas of moving objects, due to image retention
Found on
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=723-06-63
No exact match found.
