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Why comet's orbits are so different from planets?

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Comets originate from the Oort cloud, a vast body of small objects that orbit the sun way out there past pluto. The majority of these objects orbit the sun in pretty much the same way planets do: in an spherical fashion. The comets you're referring to are those that sweep by close to the sun after being in orbit far away. read more

” ———— We see a comet because the outer layers of the nucleus melt and boil off, forming the coma and tails. [1] This means the comet has to have come fairly close to the Sun. If the comet stayed close to the Sun, all the volatile material would soon boil off, leaving a pile of rubble. read more

The long period comet orbits are oriented in all different random angles while the short period comets orbits are within about 30 degrees of the solar system plane (ecliptic). These orbital characteristics point to two regions beyond the realm of the planets: the Oort Cloud and the Kuiper Belt. read more

Any model of solar system formation must explain why terrestrial planets and jovian planets formed differently true Any model of solar system formation must explain why comets come from the Oort Cloud, with orbits very different from the planets, asteroids, and Kuiper Belt Objects. read more

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