comets. Formerly
to comets have been related to adverse events, wars, epidemics. The word comet comes from the Greek for "hair", referring to the morphology of these stars.
Currently, the most accepted hypothesis is that made by the astronomer Oort, that there is a vast region of space located between 40,000 and 150,000 AU in which there are 100,000,000,000 cometary nuclei, called the Oort Cloud. Due to sporadic disturbances caused by the next step of some star, some of these nuclei can be propelled into the Solar System. One of them would approach the Sun as hyperbolic or parabolic orbits and move away then disappearing. Other cores, due to the gravitational influence of the Sun and planets like Jupiter and Saturn, would be captured and become periodic elliptical orbits. After completing a large number of orbits and revolutions around the Sun and would have spent their stuff and would eventually disappear by the continuous wear.
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