1) Astronomical hypothesis 2) Discovery by Jan Oort 3) Minor planet
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The Oort cloud (t or t;) or Öpik–Oort cloud, named after Dutch astronomer Jan Oort and Estonian astronomer Ernst Öpik, is a spherical cloud of predominantly icy planetesimals believed to surround the Sun at up to 50,000 AU. This places the cloud a quarter of the distance to Proxima Centauri, the nearest star to the Sun. The Kuiper belt and the...
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http://en.wikipedia.org/wiki/Oort_cloud
Cloud of cometary nuclei that surrounds the sun at a distance of many thousands of astronomical units.
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http://planetfacts.org/space-terms/
A large swarm of comets theorized to orbit the sun in the neighborhood of 50,000 AU.
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http://www.braeunig.us/space/glossary.htm
immense, roughly spherical cloud of icy small bodies that are inferred to revolve around the Sun at distances typically more than 1,000 times that of ... [11 related articles]
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http://www.britannica.com/eb/a-z/o/22
A vast reservoir of ice dwarfs, or deep-frozen cometary nuclei, which marks the material outer limit of the solar system and the maximum extent of the Sun's gravitational influence. It is named after Jan Oort, though Ernst Öpik was the first to postulate its existence. Studies of the orbits o...
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http://www.daviddarling.info/encyclopedia/O/OortCloud.html
A large number of comets theorized to orbit the sun in the neighborhood of 50,000 AU.
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http://www.encyclo.co.uk/visitor-contributions.php
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.
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http://www.seasky.org/astronomy/astronomy-glossary.html
The theoretical shell of comets circling the Solar System at approx. 1 light year.
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http://www.solarspace.co.uk/Glossary3.php
[
n] - (astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto
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http://www.webdictionary.co.uk/definition.php?query=Oort%20cloud
region of space beyond Pluto where comets lie
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https://sciencetrek.org/sciencetrek/topics/asteroids_comets/glossary.cfm
noun (astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto; perturbations (as by other stars) can upset a comet`s orbit and may send it tumbling toward the sun
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https://www.encyclo.co.uk/local/20974
Spherical cloud of comets beyond Pluto, extending out to about 100,000 astronomical units (approximately 1.6 light years) from the Sun. The gravitational effect of passing stars and the rest of our Galaxy disturbs comets from the cloud so that they fall in towards the Sun on highly elongated orbits, becoming visible from Earth. As many as 10 trilli...
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https://www.encyclo.co.uk/local/21221
a region of the solar system far beyond the orbit of Pluto in which billions of comets move in nearly circular orbits unless one is pulled into a highly eccentric elliptical orbit by a passing star.
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https://www.infoplease.com/dictionary/oort-cloud
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