Why do the orbits of comets often experience noticeable changes as they move through the planetary system?

The gravitational forces from the planets distort the comet’s original elliptical orbit. Changes in orbits accumulate from revolution to revolution around the Sun.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.