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Topic: Double planet

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Planet X

Argument of the perihelion

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Orbital speed

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Charon

Standard gravitational parameter

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Binary star

Mercury (planet)

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Longitude of the ascending node

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	Double planet - Wikipedia, the free encyclopedia
		A double planet is an informal term used to describe two planets that orbit each other about a common center of mass that is not located within the interior of either planet.
		The second usage for the term double planet, in the context of the theory of the origin of the Moon (i.e.
		A double planet in this sense occurred in the very early solar system, consisting of the proto-Earth and a second, Mars-sized planet that collided with it at an oblique angle, in the consensus hypothesis of the formation of the Earth-Moon system.
	en.wikipedia.org /wiki/Double_planet (983 words)

	Pluto & Charon - Double Planet Meets Triple Star
		Seen from the Earth, this planet moved in front of two different stars on July 20 and August 21, respectively, providing observers at various observatories in South America and in the Pacific area with a long awaited and most welcome opportunity to learn more about tenuous atmosphere of that cold planet.
		When the star moves behind the planet, the stellar rays suffer minute deviations as they are refracted (i.e., bent and defocussed) by the planet's atmospheric layers.
		This effect, together with the large distance to the planet, manifests itself as a gradual decline of observed intensity of the stellar light, rather than an abrupt drop as this would be the case if the planet had no atmosphere.
	www.brightsurf.com /ESO_news_090202.html (1515 words)

	HubbleSite - NewsCenter - First ESA Faint Object Camera Science Images Pluto - the "Double Planet" (10/04/1990) - ...
		The ninth and last real planet known, and the only planet that has not been visited by a fly-by spacecraft, Pluto was discovered just 60 years ago by the American astronomer Clyde Tombaugh, who was searching for the source of irregularities seen in the orbits of Uranus and Neptune.
		Due to the physical proximity of the two planets and the great distance to the system, it is extremely difficult to clearly resolve the pair from the Earth except in exceptional circumstances.
		Detailed analysis of the brightness variations of the two planets will provide a wealth of information on their surfaces and atmospheres which are impossible to obtain from the ground.
	hubblesite.org /newscenter/archive/releases/1990/14/image/a (868 words)

	double planet
		There is controversy over where to draw the line between a double planet and a system consisting of a planet and a moon.
		A commonly accepted criterion of a double planet is when the center of gravity of the two objects is not located inside either body.
		The question of whether Pluto is a planet at all, or should instead be regarded as a large, wayward Kuiper Belt object is a separate matter.
	www.daviddarling.info /encyclopedia/D/double_planet.html (209 words)

	Planet Ultra Cycling Events
		Planet Ultra is a state of mind, a way of life, a place to seek solace and inspiration, to take refuge, to find insight and inspiration.
		Planet Ultra exists everywhere in the hearts and minds of all that live a path enlightened by the motto, "by endurance we conquer."
		On Planet Ultra, bicycles are both a means of transportation and a tool for self-discovery while exploring the whole panorama of roads, places, sights and sounds that this great planet has to offer.
	www.planetultra.com (826 words)

	SPACE.com -- Q&A: The IAU's Proposed Planet Definition
		A: The word “planet” comes from the Greek word for “wanderer”, meaning that planets were originally defined as objects that moved in the sky with respect to the background of fixed stars.
		The reason they are called a “double planet” is that their common centre of gravity is a point that is located in free space outside the surface of Pluto.
		Therefore neither of these bodies independently satisfies the definition of “planet.” The fact that their size (mass) and shapes does not qualify them as planets implies that they must be called satellites, even though the center of gravity (called the “barycentre”) about which they orbit is located outside the surface of Pluto.
	www.space.com /scienceastronomy/060816_planet_qanda.html (2829 words)

	Definition of planet - Wikipedia, the free encyclopedia
		Alan Stern recently objected that "it is impossible and contrived to put a dividing line between dwarf planets and planets," and that since neither Earth, Mars, Jupiter, nor Neptune have entirely cleared their regions of debris, none could properly be considered planets under the IAU definition.
		The IAU's definition mandates that planets be large enough for their own gravity to form them into a state of hydrostatic equilibrium; this means that they will reach a shape that is, if not spherical, then spheroidal.
		This is met by the observation that, if so, the term 'minor planets' (which are also not planets) would share the same difficulties, although this term has been in use for many years, and that therefore 'dwarf planet' (and 'minor planet') is best considered as being a compound noun.
	en.wikipedia.org /wiki/Definition_of_planet (4621 words)

	Pluto
		Pluto is the ninth planet in the solar system and the farthest planet from the Sun.
		almost the size of the planet itself, so scientists sometimes refer to the two as a double planet.
		it is the only planet that has not yet been studied with spacecraft.
	www.kids-and-space.com /sites/pluto.htm (146 words)

	SPACE.com -- Nine Planets Become 12 with Controversial New Definition
		Planet sizes are shown to scale but their orbital distances are not to scale.
		Pluto would remain a planet and its moon Charon would be reclassified as a planet.
		In particular, this aspect was criticized: A pair of round objects that orbit around a point in space that is outside both objects—meaning the center of gravity (or barycenter) is between the two planets in space as with Pluto and Charon—would be called double planets.
	www.space.com /scienceastronomy/060816_planet_definition.html (1541 words)

	HubbleSite - NewsCenter - Hubble Portrait of the "Double Planet" Pluto & Charon (05/16/1994) - Release Images
		Hubble Portrait of the "Double Planet" Pluto & Charon
		This is the clearest view yet of the distant planet Pluto and its moon, Charon, as revealed by NASA's Hubble Space Telescope (HST).
		Pluto typically is called the double planet because Charon is half the diameter of Pluto (our Moon is one-quarter the diameter of Earth).
	hubblesite.org /newscenter/archive/releases/1994/17/image/a (367 words)

	Double Punch - Planet DarkAges Forums
		That is my point, most war/monks use the slap because it is more compatible with gear (and because it is slightly faster, so you can assail and mover better).
		Now the reason I suggested changing double punch is because it would give the monks the CHOICE, to use either animation.
		Any monk would still be able to use the old one simply by having assail first in their skillpage, just like they now can use the kick by placing triple kick first.
	www.planetda.net /index.php?showtopic=9782 (997 words)

	Hubble Space Telescope Images Pluto - the "Double Planet" (Site not responding. Last check: 2007-11-06)
		Pluto is the last of the solar systems nine known planets and it is the only planet that has not been visited by a spacecraft from Earth.
		Plutols north pole is upside down with respect to the other planets and it rotates in the opposite direction from them.
		Because of this Pluto is often referred to as a double planet.
	www.gsfc.nasa.gov /gsfc/lithos/hst/pluto/pluto.htm (430 words)

	7th Cover for Double Live???? - Planet Garth Forums (Site not responding. Last check: 2007-11-06)
		I heard about a month ago that Garth was supposed to release a seventh cover to "Double Live" on Oct. 24.
		Planet Garth's classified ad system has been rebuilt, and is now better than ever.
		Planet Garth is produced by Brandon Wiesner and Doug Hass, in association with Riverport Communications, Analogue Communication, Roughstock, and Rhythmicity.
	www.planetgarth.com /forums/showthread.php?p=84844 (189 words)

	StarChild: The Dwarf Planet Pluto
		For many years, Pluto was thought of as the farthest known planet from the Sun.
		Since the year 2000, astronomers realized that Pluto was not like the other eight planets but very much like a new group of objects found in the outer solar system.
		In 2006, astronomers re-classified Pluto to be a dwarf planet.
	starchild.gsfc.nasa.gov /docs/StarChild/solar_system_level1/pluto.html (219 words)

	BBC News \| SCI/TECH \| Astronomers find distant 'double planet'
		The pair are situated among a group of at least 70,000 objects, known as the Kuiper Belt, that circle the Sun beyond the most distant planet Pluto.
		Furthermore, images of the body taken by accident during observations of other objects and tracked down in astronomical archives also revealed it to be either a double or elongated in shape.
		They think that Pluto and Charon should be regarded as the largest Kuiper Belt objects, and the first known example of a double planet.
	news.bbc.co.uk /1/hi/sci/tech/1283621.stm (299 words)

	Multiple Planet systems
		The first, Upsilon Andromedae, is a triple planet system that was discovered by the Lick and AFOE teams in 1999.
		This announcement has been followed by the detection of several double planet systems.
		After accounting for the velocity variation attributable to the one known planet, we evaluated the residual velocities for evidence of a second trend that could be consistent with Keplerian velocity variations.
	exoplanets.org /mult.shtml (156 words)

	Review of The Double Planet
		This is the story of those efforts; of the long struggle to show that the Earth is round and that it rotates on its axis.
		From far out in space, the Earth and the Moon would seem two planets, rather than a planet and a satellite; in fact, a double planet.
		He carries the story form ancient times to this very moment, when we are on the point of reaching a new climax by actually landing on the Moon, the other half of–the double planet.
	homepage.mac.com /jhjenkins/Asimov/Books/Book040.html (509 words)

	Pluto, 9th Planet » Ad Terras Per Aspera (Site not responding. Last check: 2007-11-06)
		Now, for those in the dark, the International Astronomical Union has decided Pluto is no longer a planet, due to a slight technicality: Pluto’s orbit crosses Neptune’s, but not in any real and useful way.
		Charon isn’t technically moon of Pluto, they both oribt around each other as they orbit around the Sun, so it is a double planet system; but under the new clarification of the rules, its a simple “dwarf” double planet system.
		Pluto is a planet and it affects humans horoscope chart.
	adterrasperaspera.com /blog/2006/08/25/pluto-9th-planet (676 words)

	Space Today Online -- Exploring the Solar System - Planet Pluto - New Horizons
		Including the planet, the total number of objects known to be in that vicinity is four.
		Each of the four giant gas planets in the outer Solar System – Jupiter, Saturn, Uranus, Neptune – is orbited by rings of dust and small particles of matter.
		As it approaches the planet, the New Horizons spacecraft should be able to detect moons around Pluto only one-tenth that size — 0.62 miles in diameter.
	www.spacetoday.org /SolSys/Pluto/PlutoNewHorizons.html (2092 words)

	Jet Propulsion Laboratory: Planets
		Taking 248 years to orbit the Sun, Pluto is the smallest and most distant planet from the Sun.
		Pluto is sometimes considered a double planet system because its moon, Charon, is about half Pluto's size, making Charon the largest satellite in the solar system in proportion to the size of its planet.
		This distant planet is the only one in our solar system yet to be visited by spacecraft, but NASA is exploring the possibility of such a mission.
	www.jpl.nasa.gov /solar_system/planets/pluto_index.html (116 words)

	Much ado about Pluto
		It is the only planetary orbit which crosses that of another planet (Neptune), and it is tilted 17 degress with respect to the plane of the solar system.
		Except for Pluto, all of the outer planets -- Jupiter, Saturn, Uranus and Neptune -- are gaseous giants.
		It seems that Pluto is a sentimental favorite to remain a planet among both scientists and the public.
	science.nasa.gov /newhome/headlines/ast17feb99_1.htm (1376 words)

	Planet Ark : Double Forest Area Under Local Control, Group Says
		OSLO, Norway - The world should double the area of forests under the control of local communities by 2015 as part of an effort to combat poverty, a new international group said on Wednesday.
		"The group aims to assist communities and governments to double the global forest area under community ownership and management by 2015," it said.
		UN goals for halving poverty by 2015 could not be achieved unless governments helped the 1.6 billion people who depended on forests for their livelihoods, it said.
	www.planetark.org /dailynewsstory.cfm/newsid/36225/story.htm (687 words)

	ESA - SMART-1 - Welcome to the double planet
		The Moon is already no longer seen merely as a satellite, but as the Earth's daughter, forming a 'double planet'.
		The artist Leonardo da Vinci was perhaps the first to figure out 500 years ago that the subtle glow on the dark part of a crescent Moon is due to light from the Earth.
		The Moon is almost as wide as the planet Mercury, and 27% of the width of Earth.
	www.esa.int /SPECIALS/SMART-1/SEMO1VMKPZD_0.html (479 words)

	www.myspace.com/planetdoubledee
		Planet Double Dee is in your extended network
		Planet Double Dee's Latest Blog Entry [Subscribe to this Blog]
		View All of Planet Double Dee 's Friends
	www.myspace.com /planetdoubledee (59 words)

	Planet Jr. Double Wheel Cast Iron Farm Garden Seeder Seed Planter 1870 - 5224
		This is an antique seeder marked "PAT AUG 25 70, RE'D OCT 9 70, PAT NOV 24 68" plus a part number "A 5" on one side.
		The top is marked "PLANET JR." A lot of the green paint has worn off and it has surface rust.
		The wood handles show a lot of wear but PLANET JR.
	www.rubylane.com /shops/charmingandcheap/item/5224 (317 words)

	Buy Planet Waves Coil 25 RCA Double online at Musician's Friend
		Planet Waves premium-quality RCA cable includes 2 layers of insulation and 2 layers of shielding so the full sound spectrum is transferred, while hum, buzz, and other microphonics are eliminated.
		When engineering excellence is combined with industry common sense, you hear the results.
		Planet Waves gets the fundamentals right at every step along the signal path.
	musiciansfriend.com /product/Planet-Waves-Coil-25-RCA-Double?sku=339100 (157 words)

	Waking Planet - The double rainbow symbolizes the portal to peace we can now walk through
		Waking Planet - The double rainbow symbolizes the portal to peace we can now walk through
		It is very beautiful and I think it symbolizes the portal to peace we are now walking through.
		I call it the double rainbow and because it exists only through our observation, it is also a symbol of our inner power to create meaningful change.
	www.wakingplanet.com /double-rainbow.asp (101 words)

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