Comet is a cloud of frozen gas, ice, dust and
rock and travels round the Solar System in
paths or orbits. The brightest
comets are
only a few hundred kilometres
in size,
but their bright tails may be millions of kilometres
long. A complete orbit by a comet is called its period.
As a comet travels towards the Sun, the
Sun's rays
knock particles out of the comet and push them away to make a long tail.
The tail
is made up of glowing gas and dust.
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