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The temperature of objects this far out is around -220 degrees Celsius

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The objects this far out from the sun are very weakly held by the suns gravity. As a result, if the solar system passes by nearby stars, the objects in the Oort Cloud may be affected by the other stars gravity causing the objects to hurtle inwards towards the sun, or be slung into intersteller space.

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There are two believed parts of the Oort Cloud. An inner disk like region and an outer spherical region

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The large majority of objects will remain in the Oort Cloud forever, orbiting the sun in periods of thousands, even millions of year orbits.

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The Oort Cloud is thought to be the origin of a type of comet known as long-period comets, which take more than 200 years to orbit around the sun.

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It is thought that there are between billions and trillions of objects in the Oort Cloud that in total are equal to about 1.9 earth masses.

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Put into persepective that the Voyager 1 spacecraft is moving at a speed of roughly a million miles a day, it would take nearly 30,000 years to cross.

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Extending far out beyond the Keiper Belt the Oort Cloud begins at a distance of around 2000 AU from the sun and extends out about one third of the way to Alpha Centari - between 5000 and 100,000 AU.

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The comets and astroids in the Oort Cloud are made up of what formed the planets during the creation of the solar system - mainly ammonia, ice, and methane

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The composition of the Oort Cloud is made up of icy bodies such as comets and astroids

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The Oort Cloud is a theorized spherical cloud of icy bodies that surround the solar system which marks the extent to which the Sun's gravitational boundry extends. The theory of the Oort Cloud's existance is a theory as it is unable to be visually proven to exist through the use of modern telescopes, however the reason it is thought to be there is that it is the origin of long-period comets.

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-Crashcourse. (2015, June 25). The Oort Cloud: Crash Course Astronomy #22. Retrieved March 26, 2018, from https://www.youtube.com/watch?v=ZJscxTyI__s
-Redd, N. T. (n.d.). Oort Cloud: The Outer Solar System's Icy Shell. Retrieved March 26, 2018, from https://www.space.com/16401-oort-cloud-the-outer-solar-system-s-icy-shell.html
-ScienceChannel. (2016, December 01). Here's How The Oort Cloud Formed at the Birth of Our Solar System. Retrieved March 26, 2018, from https://www.youtube.com/watch?v=3qASlzmER_Q
-Scishowspace. (2014, June 17). The Oort Cloud: Believe it or Not. Retrieved March 26, 2018, from https://www.youtube.com/watch?v=wIjnI5BOHxE
-Solar System Exploration: In Depth. (2018, January 23). Retrieved March 26, 2018, from https://solarsystem.nasa.gov/solar-system/oort-cloud/in-depth/