Oort Cloud
In 1950, Jan Hendrik Oort (1900-1992) inferred the existence of the Oort Cloud from the physical evidence of long-period comets entering the planetary system.
Oort cloud
This image is an artist's rendering of the Oort cloud and the Kuiper Belt.
This diagram shows the presumed distance of the Oort cloud compared to the rest of the solar system.
Oort Cloud
Yet to be directly observed, the Oort cloud is a spherical distribution of icy bodies presumed to exist in the far reaches of the Solar System.
Oort Cloud
Related Category: Astronomy: General
see comet.
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Comet - [Gr.,=longhaired], a small celestial body consisting mostly of dust and gases that moves in an elongated elliptical or nearly parabolic orbit around the sun.
Oort cloud
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The Oort cloud is a spherical cloud around a star or other celestial body, composed of tiny ice particles, dust and other debris, ...
Oort cloud
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Oort Cloud :
Comets also are cosmic debris, probably planetesimals that originally resided in the vicinity of the orbits of Uranus and Neptune rather than in the warmer regions of the asteroid belt.
The Oort cloud is the largest source of comets in our solar system, with the Kuiper Belt being the second.
The Oort cloud is an immense spherical cloud surrounding the planetary system and extending approximately 3 light years, about 30 trillion kilometers from the Sun.
Definition: Oort Cloud: A theory, now widely accepted, that the Sun is surrounded by a distant cloud of comet-stuff, now called the Oort Cloud, bits of which are occasionally hurled into the solar system as comets.
Formation of the Oort cloud. Any modern theory about cometary origins must first explain the origin of the Oort cloud. None of the comets observed today left the Oort cloud more than three or four million years ago.
Oort Cloud
The Oort Cloud is a large spherical cloud with a radius from 50,000 to 100,000 A.U. surrounding the Sun filled with billions to trillions of comets. It has not been directly observed.
OORT CLOUD - Vast spherical swarm ~1012-1013 long-period comets orbiting the Solar System with semimajor axes between 1,000 and 50,000 AU (0.25 pc), typically with low orbital eccentricity.
Oort Cloud Spherical halo of material surrounding the solar system, out to a distance of about 50,000 A.U., where most comets originate.
Oort Cloud
(a) Home of most Solar System comets.
(b) HI regions extending to more than 100,000 AU from the Sun, barely gravitationally bound, postulated as the birthplace of comets.
Oort's Constants ...
Oort cloud: Vast spherical swarm of comets orbiting our Solar System from roughly 2,000 to 100,000 AU.
Oort cloud -- A large number of comets theorized to orbit the sun in the neighborhood of 50,000 AU.
OPCT -- Operations Planning and Control Team at JPL, "OPSCON." Obsolete, replaced by DSOT, Data Systems Operations Team.
Oort cloud
The theorized cluster of long-period comets located approximately 50,000 AU's from the Sun.
orbit
The elliptical path of an object that is gravitationally bound to another object.
Oort Cloud
a theoretical shell of comets that is believed to exist at the outermost regions of our Solar System. The Oort cloud was named after the Dutch astronomer who first proposed it.
Oort cloud: The cloud of icy bodies - extending from the outer part of our solar system out to roughly 100,000 AU from the sun - which acts as the source of most comets.
opacity: The resistance of a gas to the passage of radiation.
Oort Cloud - The region beyond the planetary system, extending to 100,000 AU or more, within which a vast number of comets orbit the Sun. When comets from the Oort cloud enter the inner solar system, they become new comets ...
The Oort Cloud
In 1950, Dutch Astronomer Jan Oort proposed that a large, spherical cloud of comets surrounds the solar system. The Oort Cloud is supposed to be almost 1 light year in radius and could contain up to a trillion small, icy comets.
The Oort Cloud
The Oort cloud is a postulated spherical cloud of comets situated about 50,000 to 100,000 AU from the Sun.
Oort Cloud
A vast spherical region in the outer reaches of our solar system where a trillion long-period comets (those with orbital periods greater than 200 years) reside.
OORT CLOUD
The Oort Cloud is a cloud of rocks and dust that may surround our . This cloud may be where long-period originate. The Oort Cloud was named for Jan H. Oort, who proposed its existence in 1950.
OORT CLOUD
The Oort Cloud is a cloud of rocks and dust that may surround our solar system. This cloud may be where long-period comets originate. The Oort Cloud was named for Jan H. Oort, who proposed its existence in 1950.
Oort Cloud
Another outer region of the solar system is the Oort Cloud, a theoretical cloud of comets that surrounds the solar system out to a distance of two light-years (11.36 trillion miles). The Oort Cloud was first proposed by Jan Oort in 1950.
Oort Cloud
The theoretical shell of comets circling the Solar System at approx. 1 light year.
Orbit ...
Oort Cloud
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Oort cloud
The Oort cloud is a hypothetical spherical cloud of comets which may lie roughly 50 000 astronomical unit, or nearly a light-year, from the Sun....
is hypothesized to be the main reservoir of dormant comets.) Other recent observations, ...
Oort cloud - (n.)
a vast collection of bodies made up of rock and ice that orbit the Sun at a distance starting in the region beyond the orbit of Pluto and extending out to nearly 1.5 light-years or 50,000 A. U.
The Oort cloud in our Solar System has long been thought to have formed from the Sun's proto-planetary disc, but models suggest that there would not be enough material to account for its population. In comes Levison et al's idea.
The Oort Cloud may account for a significant fraction of the mass of the solar system, perhaps as much or even more than Jupiter. (This is highly speculative, however; we don't know how many comets there are out there nor how big they are.) ...
The Oort Cloud
The large planetoids, such as Sedna and Quaoar, as well as comets and other smaller bodies, may be part of something astronomers call the Oort Cloud.
O
OORT CLOUD
A huge cloud which is thought to surround our solar system and reach over halfway to the nearest star. Comets originate in the Oort Cloud.
ORBIT
A specific path followed by a planet, satellite, etc.
Beyond The Oort Cloud
The Sun's solar winds continue pushing outward until they finally begin to mix into the interstellar medium, becoming lost with the winds from other stars. This creates a sort of bubble called the Heliosphere.
Oort cloud (NASA Thesaurus) A region of millions of comets between 30,000 and 100,000 A.U. from the sun. Comets are perturbed out of the Oort cloud by passing stars and fall into the inner solar system.
Comets from the Oort Cloud follow long, stretched-out orbits that take them far back into the frigid realm of deep space, while Kuiper Belt comets follow shorter orbits that can bring them close to the Sun every few years.
They are generally classified as belonging the "Oort cloud" on the fringes of the solar system, at distances estimated at 100,000 AU, named after the Dutch astronomer Jan Oort who proposed its existence.
Formation of the Oort cloud
Possible pre-solar-system origin of comets
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The hypothetical Oort cloud is a great mass of up to a trillion icy objects that is believed to be the source for all long-period comets and to surround the Solar System at around 50,000 AU, and possibly to as far as 100,000 AU.
Comets were originally thought to come from the Oort Cloud, a spherical region that extends about 50,000 AU from the Sun where the cores of comets reside.
1950 - Jan Oort suggests the presence of a cometary Oort cloud
1951 - Gerard Kuiper argues for an annular reservoir of comets between 40-100 astronomical units from the Sun, the Kuiper belt ...
The comets that are more likely to be easily visible are much rarer, and are thought to come from a great spherical cloud of cometary material surrounding the Solar System called the Oort Cloud.
Sedna is a reddish-colored, planet-like body located in the Oort Cloud, approximately 13 billion kilometers (8 billion miles) away (three times farther from Earth than Pluto).
There is also a threat of impacts by comets falling into the inner Solar System after having been disturbed from their orbits in the "Oort Cloud", a huge, tenuous sphere of comets surrounding the Solar System.
Comets are usually in the outermost regions of the Solar system (the Oort cloud), where it is extremely cold. Water ice can survive billions of years in the Oort cloud.
Comets are thought to have originated in a cold area beyond Neptune and Pluto called the Oort Cloud. This cloud surrounds the solar system. Another area where comets are found is called the Kuiper (KIE per) Belt -- just past Neptune's orbit.
A triple star that lies 16 light-years away and has the first white dwarf ever discovered. [C95]
Oort Cloud ...
Some scientists believe that there may be a second star in our solar system, but we can not see it. They have even gone so far as to name it ‘Nemesis'. It is theorized that it exists beyond the Oort Cloud; therefore, ...
This spherical cloud contains about 10,000,000,000,000 (ten American trillion) comets. Sometimes a comet will leave the Oort Cloud and travel towards the Sun. When they are near the Sun, they develop tails and we can often see them from Earth.
At its far end, this disc fans out into the Oort Cloud, an enormous sphere of comets which enshrouds the solar system 10,000 astronomical units from the Sun -- a significant fraction of the distance to the nearest star.
The heliosphere is the cavity around the Sun in the local interstellar medium that is produced by the solar wind. The heliosphere contains most of the solar system, but not the most distant comets, such as in the Oort cloud.
54 AU, Uranus's is 19.19 AU, and Neptune's is 30.07. The Kuiper belt of planetoids ranges from 30 to 50 AU. Finally, the Oort cloud, which gives birth to the long-period comets, is more than 100 AU from the Sun.
Indeed, if they were very far away (like a comet in the Oort cloud which you will learn about in August) their synodic period would be very much the same as the Earth's sidereal period of 365.24 days.
of icy objects existing far outside the solar system but well within the Sun's gravitational influence. Collisions between comets or gravitational nudges by nearby stars disturb these objects, sometimes sending one towards the Sun. The Oort cloud ...
The first such comets were discovered in the Kuiper cloud in 1992; by 1996, 31 had been found. The Oort cloud accounts for long-period comets, such as Halley's and the Swift-Tuttle (with a period of 130 years), ...
The gas giant planets and their satellites resemble miniature solar systems.
The planets are well-spaced in their orbits.
Comets come from a region out beyond Pluto (known as the Oort Cloud).
 See also: Solar, Orbit, Planet, Solar System, Sun
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