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Topic: Nine Planets

	Planet - Wikipedia, the free encyclopedia
		Smaller terrestrial planets lose most of their atmospheres due to this accretion, but the lost gases can be replaced by outgassing from the mantle and from the subsequent impact of comets.
		The planet, a gas giant slightly larger than Jupiter, orbits the main star of the HD 188753 system, in the constellation Cygnus, and is hence known as HD 188753 Ab.
		Uranian planets, or ice giants, are a sub-class of gas giants, distinguished from true Jovians by their depletion in hydrogen and helium and a significant composition of rock and ice.
	en.wikipedia.org /wiki/Planet (2710 words)

	Saturn
		Saturn is the sixth planet from the Sun and the second largest:
		Saturn is the least dense of the planets; its specific gravity (0.7) is less than that of water.
		The origin of the rings of Saturn (and the other jovian planets) is unknown.
	www.nineplanets.org /saturn.html (1430 words)

	Panel says solar system has 12 planets, including Pluto - The Boston Globe
		The panel suggests retaining Pluto and immediately adding three new planets to the nine that are familiar to any schoolchild: Ceres, currently considered a large asteroid; Charon, now considered a moon of Pluto; and Xena, a recently discovered object that is larger than Pluto.
		The proposal defines a planet as an object that circles the sun and is massive enough that its own gravitational forces compress it into a roughly spherical shape.
		Ceres was considered a planet when it was discovered in 1801, but it was later demoted when scientists discovered that it was part of a large belt of similar asteroids, making it seem quite different from the planets known at the time.
	www.boston.com /news/science/articles/2006/08/16/nine_no_longer_panel_declares_12_planets (1236 words)

	The Solar System
		Satellites of the planets, comets, asteroids, meteoroids, and the interplanetary medium constitute the remaining 0.015%.
		The terrestrial planets are the four innermost planets in the solar system, Mercury, Venus, Earth and Mars.
		Obliquity is the angle between a planet's equatorial plane and its orbital plane.
	www.solarviews.com /eng/solarsys.htm (1562 words)

	The Nine Planets Glossary
		the inclination of a planet's orbit is the angle between the plane of its orbit and the ecliptic; the inclination of a moon's orbit is the angle between the plane of its orbit and the plane of its primary's equator.
		where p' is the density of the planet, p is the density of the moon, and R is the radius of the planet.
		A synchronous satellite with an orbital inclination of zero (same plane as the planet's equator) stays fixed in the sky from the perspective of an observer on the planet's surface (such orbits are commonly used for communications satellites).
	www.wanderer.org /nineplanets/help.html (4273 words)

	The Nine Planets Glossary
		An inferior planet is said to be "in inferior conjunction" when it is directly between the Earth and the Sun.
		A superior planet is "in conjunction" when it is on the opposite side of the Sun from the Earth.
		A superior planet is said to be "in opposition" when it is directly on the opposite side of the Earth from the Sun.
	www.jatobservatory.org /Arnette/nineplanets/help.html (4814 words)

	Planets - Zoom Astronomy
		The inner planets (those planets that orbit close to the sun) are quite different from the outer planets (those planets that orbit far from the sun).
		The planet with the strongest gravitational attraction at its surface is Jupiter.
		This is because the gravitational force a planet exerts upon an object at the planet's surface is proportional to its mass and to the inverse of the planet's radius squared.
	www.enchantedlearning.com /subjects/astronomy/planets (863 words)

	The Nine Planets (Site not responding. Last check: 2007-10-30)
		Each of the nine planets is described in detail: distance from the sun, temperature, size, speed in orbit, inclination, mass and density is discussed.
		It is a small planet, 4,218 miles in diameter, and the outermost of the rocky worlds at 142 million miles from the sun.
		Nine students will then come to the chalkboard and draw a planet and its orbit around the sun as the worksheet illustrates.
	www.fhsu.edu /te/facstaff/gtaggart/lessons/98/planets.html (6393 words)

	NASA's Solar System Exploration: Planets: Our Solar System: Overview
		The four planets closest to the Sun - Mercury, Venus, Earth, and Mars - are called the terrestrial planets because they have solid rocky surfaces.
		The four large planets beyond the orbit of Mars - Jupiter, Saturn, Uranus, and Neptune - are called gas giants.
		There are 162 known natural satellites (also called moons) in orbit around the various planets in our solar system, ranging from bodies larger than our own Moon to small pieces of debris.
	solarsystem.nasa.gov /planets/profile.cfm?Object=SolarSys&Display=OverviewLong (637 words)

	BBC News \| SCI/TECH \| Nine new planets found
		Astronomers have found nine new planets circling nearby stars, an astronomical conference was informed on Monday.
		The planets are still hidden but they write their signature in the dust, say the researchers.
		It's quite frightening that virtually all the planets we've found orbit close to their stars where they heat up and then move out to where they cool down.
	news.bbc.co.uk /1/hi/sci/tech/868975.stm (895 words)

	StarChild: The Planets
		A planet is a large space object which revolves around a star.
		Nine planets have been discovered in our solar system.
		The outer planets are Jupiter, Saturn, Uranus, Neptune, and Pluto.
	starchild.gsfc.nasa.gov /docs/StarChild/solar_system_level1/planets.html (141 words)

	Nine Familiar Planets, Now With Personality-Plus - New York Times
		The planets make their appointed rounds at distances measured in millions or billions of miles, yet their personal magnetism, so to speak, and the visible presence of beloved orbs like Venus and Mars, make them feel almost like family - all part of the same happy solar system.
		Sobel, the author of "Longitude" and "Galileo's Daughter," has aimed "The Planets" squarely at a mass audience receptive to the romance of the heavens, ready to have its mind boggled by weird and wonderful facts, and eager to coo and trill over verbal baby pictures of peppy little Mercury and seductive Venus.
		Sobel, in a brief preface recalling her earliest infatuation with the planets, describes a class play in which a student twirling two Hula-Hoops played Saturn and she appeared as the Lonely Planet.
	www.nytimes.com /2005/10/19/books/19grim.html?ex=1287374400&en=348777ed91cdf0e8&ei=5088&partner=rssnyt&emc=rss (829 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 (1503 words)

	Planets
		The existence of these magnetospheres is independent of whether the planet has an internally generated or intrinsic magnetic field, but the nature of these magnetospheres is quite dependent on this fact.
		or the planets that have any internal magnetic dynamo, the solar wind induces a magnetosphere through its interaction with the upper atmosphere and ionosphere.
		The history, mythology, and current scientific knowledge is provided for each of the nine planets in our solar system.
	www.matter-antimatter.com /planets.htm (237 words)

	CNN.com - Scientists reveal nine new planets - August 7, 2000
		None of the planets have ever been seen by humans, but scientists know they exist because of the gravitational pull they exert on the stars they orbit and the subsequent detectable effect they have on the light the stars emit.
		The planets circle the HD 83443 star, which is 141 light years away from our solar system in the Vela constellation.
		The Geneva team also discovered planet HD 190228, which is 203 light years away and was found using information gathered at an observatory in Haute-Provence, France.
	archives.cnn.com /2000/TECH/space/08/07/space.planets/index.old.html (762 words)

	Cosmic Distance Scales - The Solar System
		Mercury, shown at left in a Mariner 10 image, is the closest planet to the Sun - it orbits at an average distance of 57,910,000 km, or 0.38 AU from Sun.
		The planet is named after her, most likely because it is the brightest of the planets that was known to the ancients.
		Most of the planets spin on an axis nearly perpendicular to the plane of the ecliptic but Uranus' axis is almost parallel to the ecliptic.
	heasarc.gsfc.nasa.gov /docs/cosmic/planets.html (2122 words)

	NASA's Solar System Exploration: Planets: Our Solar System: Kid's Eye View (Site not responding. Last check: 2007-10-30)
		Our solar system is made up of a star - the Sun - nine planets, 162 moons and a bunch of comets, asteroids and other space rocks.
		Planets discovered in our solar system since the invention of the telescope about 400 years ago.
		Number of planets in our solar system with liquid water on the surface.
	www.solarsystem.nasa.gov /planets/profile.cfm?Object=SolarSys&Display=Kids (279 words)

	The Planets - Astronomy for Kids (Site not responding. Last check: 2007-10-30)
		The nine planets that make up our solar system range from very tiny rocky planets to huge gas giants featuring fascinating ring systems.
		Our home planet is a very beautiful place with the most varied surface in the entire solar system.
		In ancient times, Mars may have harbored some kind of life, and there is a lot of research going on now trying to get a definitive answer as to whether we are the only life forms in the solar system.
	www.dustbunny.com /afk/planets (711 words)

	Introduction and FAQ (Site not responding. Last check: 2007-10-30)
		The planets are too small to have a significant gravitational effect on the Earth.
		A "planet" is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.
		A "dwarf planet" is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape2, (c) has not cleared the neighbourhood around its orbit, and (d) is not a satellite.
	www.seds.org /nineplanets/nineplanets/intro.html (2330 words)

	Nine
		They were nine in number, to each of whom was assigned presidence over some particular department of literature, art, or science.
		Calliope was the muse of epic poetry, Clio of history, Euterpe of lyric poetry, Melpomene of tragedy, Terpsichore of choral dance and song, Erato of love poetry, Polyhymnia of sacred poetry, Urania of astronomy, Thalia of comedy.
		There are Nine supreme court justices for the United States of America.
	www.fortunecity.com /victorian/villiers/17/nine.html (461 words)

	FAR OUT / NINE PLANETS? ASTRONOMERS TO VOTE ON NAMING 3 MORE
		The solar system we've all known since childhood is growing ever larger, from nine planets to an even dozen -- and many more could be added to the list -- under a resolution the world's astronomers are poised to vote on next week.
		A planet, says the committee headed by Harvard astronomer Owen Gingerich, is an object that orbits a star like the sun; is massive enough so its own gravity keeps it roughly round; and isn't a satellite of another planet, like Earth's moon.
		Then there's Xena, the so-called 10th planet: Michael Brown of Caltech, Chadwick Trujillo of the Gemini Observatory atop Mauna Kea in Hawaii and David Rabinowitz of Yale discovered that faraway body three years ago and since have found many more, which some astronomers argued are not entitled to be called planets.
	www.sfgate.com /cgi-bin/article.cgi?f=/c/a/2006/08/16/MNGE2KJEO61.DTL&feed=rss.news (997 words)

	The Nine Planets Solar System Tour
		Every planet is there along with its satellites and even a small info graph with basic facts.
		This website is an overview of the history, mythology, and current scientific knowledge of each planet and the major moons in our solar system.
		All nine planets can be seen with a small telescope; all but Pluto can be seen with binoculars.
	www.physics.louisville.edu /nineplanets (490 words)

	Planets (Site not responding. Last check: 2007-10-30)
		Planets are generally divided into two groups: the terrestrial and the giant planets.
		The terrestrial planets are the four inner planets: Mercury, Venus, Earth, and Mars.
		The giant planets are the next four: Jupiter, Saturn, Uranus, and Neptune.
	www.astro.umd.edu /education/astro/planets/planets.html (418 words)

	SPACE.com: planets, The Planets, Planets Solar System
		A planet is defined as a large non-luminous celestial mass that is generally larger than smaller celestial bodies such as comets or asteroids.
		While it is still not known precisely how the planets of our solar system were formed, the currently accepted nine planets that orbit around and are illuminated by the sun include Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto.
		The primary distinction between a star and a planet is that a star undergoes nuclear reactions on its surface, where a planet does not.
	www.space.com /planets (683 words)

	Solar System (Site not responding. Last check: 2007-10-30)
		Information and statistics on the planet and its rings, as well as pictures, movies, and a description of the Voyager 2 mission which flew closely past it.
		Information and statistics on the planet and its satellite, Charon, as well as movies, pictures, and a description of the mission which will fly by the planet around 2013.
		Information and statistics on the planet and its rings, as well as movies, pictures, and a description of the Voyager 2 mission which studied the planet.
	www.eagle.ca /~matink/themes/Solar/planets.html (1826 words)

	Amazon.ca: The Nine Planets: Books: Edward Riche (Site not responding. Last check: 2007-10-30)
		This is a serious problem considering that Marty is present in nearly every scene of The Nine Planets and much of the novel is filtered through his curmudgeonly observations.
		Like the first few victims of a teen horror movie, characters in The Nine Planets succumb to their fates without much of a fight.
		The Nine Planets asks readers to believe that the world has always been broken and simply cannot be fixed.
	www.amazon.ca /exec/obidos/ASIN/0670044563 (1447 words)

	Your Weight On Other Worlds
		First, it depends on your mass and the mass of the planet you are standing on.
		If the planet you are standing on is twice as massive, gravity also pulls on you twice as hard.
		On the other hand, the farther you are from the center of the planet, the weaker the pull between the planet and your body.
	www.exploratorium.edu /ronh/weight/index.html (780 words)

	The Nine Planets Bookstore
		This is the CD from which the sound clips in The Nine Planets are taken.
		Taken around the planet like tourists, readers will discover mysterious dry riverbeds, the largest volcano in the solar system (three times higher than Mount Everest), a possible ancient sea floor, giant impact craters, and other wonders.
		Red Mars is the brilliant beginning of a massive trilogy that continues with Green Mars and ends with Blue Mars.
	bill.nineplanets.org /bookstore.html (999 words)

	Solar System: Planets \| eThemes \| eMINTS
		This site not only shows you the planets, but also provides information about the mass, density, and temperature of each planet.
		Learn about Pluto, the smallest planet in the solar system and the one that is farthest from Earth.
		Read how the planet was formed, its geological formation, planned missions to Pluto, and why some scientists believe it is not a planet.
	www.emints.org /ethemes/resources/S00000002.shtml (872 words)

	The Nine Orbiting Planets (Site not responding. Last check: 2007-10-30)
		Each of the nine planets has an orbiting plane with the sun.
		The first four planets are rocky bodies or terrestrial planets.
		The other planets, except Pluto, are jovian or gas planets.
	homepages.ius.edu /vrharvey/planets.htm (118 words)

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