Oort Cloud Facts
Oort Cloud Facts
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Interesting Oort Cloud Facts: |
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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. |
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. |
Objects in the Oort Cloud are also called Trans-Neptunian objects. The name also applies to objects in the Kuiper Belt. |
Discovered in 2003, the planetoid Sedna is thought to be a member of the inner Oort Cloud. |
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 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. |
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. |
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. |
Halley's Comet is believed to have originated from the Oort Cloud, but is now a Kuiper Belt object. |
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. |
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. |
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