The ancients thought that comets were unlucky, which was a popular saying in ancient times. At that time, because of people's ignorance, people saw comets, thinking that they were shaped like broomsticks, with the unlucky meaning of "broomsticks", and some thought that "comets" were homophonic "unlucky", so they thought that seeing comets meant bad luck.
What does seeing a comet mean? Seeing a comet doesn't mean a disaster. It's just a natural phenomenon that people didn't understand in ancient times, so it's far-fetched and attached to a disaster. But nothing will happen when you see a comet. Modern astronomers point out that it is a normal cosmic phenomenon for a comet to fly to the earth.
the origin of comets is an unsolved mystery. It has been suggested that there is a large comet area outside the solar system, where there are about 1 billion comets, called Oort Cloud. Due to the gravity of other stars, some comets enter the solar system, and due to the influence of Jupiter, some comets escape from the solar system, while others are "captured" as short-period comets; Others believe that comets are formed near Jupiter or other planets; Others believe that comets were formed in remote areas of the solar system; Some people even think that comets are visitors from outside the solar system.
Because periodic comets have been disintegrating, there must be some way to produce new comets to replace the old ones. One possible way is to store billions of comets orbiting the sun in various possible directions in a radius of 15 astronomical units from the sun. This concept is supported by observations that aperiodic comets approach the sun in random directions along very long elliptical orbits.
with the passage of time, due to the slight gravity given by the passing stars, the orbit of a distant comet can be disturbed until the distance of its perihelion becomes less than several astronomical units. When the comet then enters the solar system, the gravitational attraction of the planets in the solar system can transform this aperiodic comet into a new periodic comet (it will exist for thousands of years before it collapses). On the other hand, these forces can completely throw it out of the comet cloud.
If this statement is correct, the 1, or so comet records in the past few centuries are only a few samples of the huge comet cloud, which has not been directly observed so far. Such comet clouds associated with individual stars may spread all over our galaxy. So far, no method has been found to detect a large number of comets that may form a set with the sun, let alone those comet clouds that form a set with other stars. The total mass of comet clouds is not clear, not only the total number of comets is difficult to determine, but also the mass of a single comet is very uncertain.
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