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Comets are made in the Kuiper Belt and the Oort Cloud.

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In 1996, the comet Hyakutake passed Earth when it was completing a journey of about 17,000 years from the Oort Cloud. It came within 9 million miles (15 million kilometers) of Earth.

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  1. Space probes have yet to reach the Oort Cloud. The inner planetary space probe Voyager 1 is currently leaving the Solar System and will reach the Oort Cloud in about 300 years and would take an estimated 30,000 years to pass through it.

  2. Halley's Comet is said to have originated in the Oort Cloud.

  3. There are two types of comets that travel through the Solar System. There are those with short periods, around a few hundred years, that stem from the Kuiper Belt which is a pancake of icy particles near the orbit of Pluto.

  4. It is spherically shaped and consists of an outer cloud and a torus inner cloud. The cloud stretches out almost a quarter of the way to the nearest star, Proxima Centauri.

  5. There are longer period comets with orbits of thousands of years that come from a distant Oort Cloud. Comets from the Oort Cloud can travel as far as three light years from the Sun. The farther they travel, the weaker the Sun's gravitational hold is.

  6. The Oort Cloud surrounding our solar system is so vast that it would take the Voyager 1 (traveling at 1 million miles per day) over 30,000 years to pass through it.

  7. In 1.35 million years, the star, Gliese 710 will be 77 light days away from our Sun. This close approach may change some orbits, especially in the outer Solar System and Oort Cloud.

  8. Halley's Comet is believed to have originated from the Oort Cloud, but is now a Kuiper Belt object.

  9. The Oort Cloud inner limits begin at about 2,000 AU from the Sun. It is so distant from the Sun, but can be disrupted by the nearby passage of a star, nebula or by actions in the disk of the Milky Way. Those actions knock cometary nuclei out of their orbits and send them on a fast rush toward the Sun. The path of the comets is constantly shifting with many factors that influence it.

  10. Discovered in 2003, the planetoid Sedna is thought to be a member of the inner Oort Cloud.

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Some astronomers believe that the Sun may have captured Oort Cloud cometary material from the outer disks of other stars that were forming in the same nebula as our star.

The farthest reaches of the Oort Cloud, a cloud of comets and planetesimals surrounding the solar system, can be up to 100,000 times the distance from the Sun to the Earth - source

The Oort Cloud comet Siding Spring was discovered on January 3, 2013. It made a very close pass by Mars in 2014 and will not return to the inner Solar System for about 740,000 years.

Objects in the Oort Cloud are also called Trans-Neptunian objects. The name also applies to objects in the Kuiper Belt.

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About the Oort Cloud, a spherical shell of icy comets surrounding our sun for a few thousand light years.

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There is a planet called Tyche hypothesized to exist in the Oort Cloud with a mass 4 times greater than Jupiter.

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