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Planet - Brown dwarf planets | A Wisdom Archive on Planet - Brown dwarf planets | | Planet - Brown dwarf planets A selection of articles related to Planet - Brown dwarf planets | |
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Planet, Planet - Brown dwarf planets, Planet - Definition and classification of planets, Planet - Extrasolar planets, Planet - Further classification, Planet - Interstellar planets, Planet - Other candidates, Planet - Planetary formation, Planet - Suggested narrow definitions, Planet - Suggested wide definitions, Planet - Within our solar system, Definition of planet, Planetary habitability, Planetary science, Planemo, Planetoid, Brown Dwarf, Planets in science fiction, Prograde and retrograde motion, Skies of other planets
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ARTICLES RELATED TO Planet - Brown dwarf planets | |
| | |  Planet - Brown dwarf planets: Encyclopedia II - Planet - Extrasolar planets
Of the 173 extrasolar planets (those outside our solar system) discovered to date (October 2005) most have masses which are about the same or larger than Jupiter's.
Exceptions include a number of planets discovered orbiting burned-out star remnants called pulsars, such as PSR B1257+12, the planets orbiting the stars Mu Arae, 55 Cancri and GJ 436 which are approximately Neptune-sized [1], and a planet orbiting Glies ...
See also:Planet, Planet - Planetary formation, Planet - Within our solar system, Planet - Accepted planets, Planet - Other candidates, Planet - Extrasolar planets, Planet - Brown dwarf planets, Planet - Interstellar planets, Planet - Definition and classification of planets, Planet - Suggested wide definitions, Planet - Suggested narrow definitions, Planet - Further classification Read more here: » Planet: Encyclopedia II - Planet - Extrasolar planets |
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| | | | Planet - Brown dwarf planets: Encyclopedia II - Planet - Definition and classification of planets Much like "continent", "planet" is a word without a precise definition, with history and culture playing as much of a role as geology and astrophysics. Recent definitions have been vague and imprecise; The American Heritage Dictionary, for instance, formerly defined a planet as:
A nonluminous celestial body larger than an asteroid or comet, illuminated by light from a star, such as the Sun, around which it revolves. In the solar system there are nine known planets: Mercury, Venus, Ea ...
See also:Planet, Planet - Planetary formation, Planet - Within our solar system, Planet - Accepted planets, Planet - Other candidates, Planet - Extrasolar planets, Planet - Brown dwarf planets, Planet - Interstellar planets, Planet - Definition and classification of planets, Planet - Suggested wide definitions, Planet - Suggested narrow definitions, Planet - Further classification Read more here: » Planet: Encyclopedia II - Planet - Definition and classification of planets |
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| | | | Planet - Brown dwarf planets: Encyclopedia - Solar system The solar system comprises our Sun and the retinue of celestial objects gravitationally bound to it. Traditionally, this is said to consist of the Sun, nine planets and their 158 currently known moons; however, a large number of other objects, including asteroids, meteoroids, planetoids, comets, and interplanetary dust, orbit the Sun as well.
Although the term "solar system" is frequently applied to other star systems and the planetary systems which may comprise them, it should strictly refer to our system specifically: the wor ...
Including:
Read more here: » Solar system: Encyclopedia - Solar system |
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| | | | Planet - Brown dwarf planets: Encyclopedia II - Brown dwarf - In theory
Brown dwarf - Distinguishing heavy brown dwarfs from light stars.
Lithium: Lithium is generally present in brown dwarfs and not in low-mass stars. Stars, which achieve the high temperature necessary for fusing hydrogen, rapidly deplete their lithium. This occurs by a collision of Lithium-7 and a proton producing two Helium-4 nuclei. The temperature necessary for this reaction is just below the temperature necessary for hydrogen fusion. Convection in stars ensures that lithium in the whole volume of the sta ...
See also:Brown dwarf, Brown dwarf - History, Brown dwarf - In theory, Brown dwarf - Distinguishing heavy brown dwarfs from light stars, Brown dwarf - Distinguishing light brown dwarfs from large planets, Brown dwarf - In practice, Brown dwarf - Observational techniques, Brown dwarf - Milestones, Brown dwarf - Recent developments Read more here: » Brown dwarf: Encyclopedia II - Brown dwarf - In theory |
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| | | | Planet - Brown dwarf planets: Encyclopedia II - Brown dwarf - In practice Typical atmospheres of known brown dwarfs range in temperature from 300 to over 3000 K, in comparison with stars, which cool to minimum temperatures of around 4000 K. Compared to stars, which warm themselves with steady internal fusion, brown dwarfs cool quickly over time; more massive dwarfs cool slower than less massive ones.
Brown dwarf - Observational techniques.
Coronographs have recently been used to detect faint objects orbiting bright visible stars, including Gliese 229B.
Sensitive ...
See also:Brown dwarf, Brown dwarf - History, Brown dwarf - In theory, Brown dwarf - Distinguishing heavy brown dwarfs from light stars, Brown dwarf - Distinguishing light brown dwarfs from large planets, Brown dwarf - In practice, Brown dwarf - Observational techniques, Brown dwarf - Milestones, Brown dwarf - Recent developments Read more here: » Brown dwarf: Encyclopedia II - Brown dwarf - In practice |
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| | | | Planet - Brown dwarf planets: Encyclopedia II - Brown dwarf - History Brown dwarfs were originally called black dwarfs, a classification for dark substellar objects floating freely in space which were too low in mass to sustain stable hydrogen fusion (black dwarfs currently refer to something different).
Early stellar models suggested that a true star requires a mass at least 80 times that of Jupiter to support such fusion. Dense star-like objects with smaller masses, or "brown dwarfs," were hypothesized by the early 1960s -- formed much the way stars are formed, they would however be hard to fin ...
See also:Brown dwarf, Brown dwarf - History, Brown dwarf - In theory, Brown dwarf - Distinguishing heavy brown dwarfs from light stars, Brown dwarf - Distinguishing light brown dwarfs from large planets, Brown dwarf - In practice, Brown dwarf - Observational techniques, Brown dwarf - Milestones, Brown dwarf - Recent developments Read more here: » Brown dwarf: Encyclopedia II - Brown dwarf - History |
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