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The Oort Cloud

The Oort Cloud The Oort Cloud is the most distant region of our solar system, many times further away than the distant Kuiper Belt. Whereas the o

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The Oort Cloud

The Oort Cloud is the most distant region of our solar system, many times further away than the distant Kuiper Belt.
Whereas the orbits of the planets and even the Kuiper Belt lie mostly in the same flat disk around the Sun, the Oort Cloud is believed to be a giant spherical shell surrounding the rest of the solar system. The rotational motion of the planetary disc from which the planets formed can be seen as resulting from conservation of angular momentum where any angular motion of the cloud from which the solar system formed is accentuated by the “spinning skater effect”. When the mass gets closer to the rotation axis, the angular velocity increases. But outer gaseous material like water molecules may not fully share in that angular momentum and remain as a nearly spherical cloud. Later condensation and accretion could produce icy chunks of material.

It is suspect that the Oort Cloud is the source of comet , partly because the period of some of the comet are so long . For example , comet C/2013 A1 Siding Spring is return , which made a very close pass by Mars in 2014 , will not return to the inner solar system for about 740,000 year . ( NASA artist conception of comet near Mars . )

The presume distance is is to the Oort Cloud is so great that it is typically state in astronomical unit or AU , where 1 AU is the distance between Earth and the Sun . For perspective , Pluto ‘s elliptical orbit is varies vary between 30 AU and 50 AU . Even though the object of the Oort Cloud have not been directly observe , they are think to begin between 2,000 and 5,000 AU from the Sun . The outer edge is is is even more uncertain , maybe 10,000 or even 100,000 AU . That large number is is is more than a quarter of the way to the near star , Proxima Centauri . It is consider to extend more than a thousand time as far from the Sun as the Kuiper Belt .

The Oort Cloud
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Though long – period comet observe among the planet are think to originate in the Oort Cloud , no object has been observe in the distant Oort Cloud itself , leave it a theoretical concept for the time being . But it is remains remain the most widely – accept explanation for the origin of long – period comet . dutch astronomer Jan Oort is proposed propose the existence of the cloud to explain ( among other thing ) where long – period comet come from , and why they seem to come from all direction rather than along the orbital plane share by the planet , asteroid and the Kuiper Belt .

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