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Comas form around comets when they approach the Sun and heat causes volatile compounds within the comet to vaporize and escape, creating a surrounding cloud of gas and dust. This process is known as outgassing, and it gives comets their characteristic glowing halo.
Folk beliefs or legends around comets often view them as omens or harbingers of significant events, such as wars or natural disasters. Scientifically, comets are primarily composed of ice, dust, and rock, and their appearance in the night sky is due to sunlight reflecting off their icy surfaces as they approach the sun. Their tails form as the sun's heat causes the ice to vaporize and release dust particles.
Comets have two main sources, the Oort Cloud or the Kuiper Belt
Comets are not a source of light themselves, but they reflect sunlight. When sunlight hits a comet's nucleus, it causes the surrounding gas and dust to glow, creating the characteristic tails we see from Earth.
Because they do not have volatiles in them to form a coma as to comets.
Comets become electrical as they pass nearby the sun. The electrically charged ions form a tail on the comet that helps to propel it away from the sun.