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Peladero Aqui se puede hablar de todo. La única regla es NO PORNO. No esperen respuestas serias en esta sección. |
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Este thread fue creado hace 6456 días. Lo mas probable es que el tema ya se haya resuelto y no necesite más discusión. Aunque si todavía crees que es necesario agregar un comentario, puedes hacerlo.
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Herramientas |
17-Aug-2006, 08:28 | #1 |
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Pluton no es planeta??? y 12 planetas en el sistema solar???!!! *&#^@(#)
Link: http://news.bbc.co.uk/2/hi/science/nature/4798205.stm
New planets proposal 2003 UB 313 will become the 12th planet, if the plan is approved(Image: Nasa/Esa/A Schaller) Astronomers have drawn up a new way to define the word planet. This would mean adding three new planets to the Solar System, boosting the current tally of nine to 12. The draft proposal by the International Astronomical Union (IAU) will be put to a vote at a meeting underway in the Czech capital Prague. Did we really have no definition for a planet before this? None that was formally agreed. For centuries, planets were simply objects that moved in the sky with respect to the background of fixed stars. The word "planet" comes from the Greek word for "wanderer". But astronomers now know of hosts of large objects orbiting the Sun in the outer reaches of our Solar System. Finally, the IAU decided it was time to agree on a scientific definition of the word. So what definition have they decided on? For a celestial object to be considered a planet, it must satisfy two conditions:
Some objects currently considered to be moons and asteroids could be eligible if they meet those basic tests. So the definition leaves the door open for other objects to join the expanding club. So was Pluto downgraded or not? In one sense, Pluto has been demoted. This world has always been the odd one out; it has less than one four-hundredth the mass of Earth and has a tilted, elliptical orbit around the Sun. NEW PLANET CANDIDATES Trans-Neptunian Objects 2003 EL61 2005 FY9 Sedna Orcus Quaoar Varuna 2002 TX300 Ixion 2002 AW197 Asteroids Vesta Pallas Hygiea The IAU's draft proposal recognises eight "classical" planets - Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune - three "plutons" - Pluto, Charon and UB313 - and the asteroid Ceres. Many astronomers think Pluto is part of a vast population of icy objects that orbit the Sun beyond Neptune, in a region called the Kuiper Belt. These objects have a different origin from planets like Earth and Jupiter; they are thought to be leftover debris from the formation of the Solar System. The new category of plutons distinguishes Pluto and other "icy dwarfs" from classical planets in that they reside in orbits around the Sun that take longer than 200 years to complete, circle the Sun with high "inclination" (are highly tilted with respect to the classical planets) and typically have orbits that are far from being perfectly circular. But the plutons fit all the criteria of the new definition of a planet, so Pluto does not receive the full demotion some astronomers had hoped for. Is the Moon now eligible to be called a planet? No. The Moon is a satellite of the Earth. There is a common centre of gravity between the Earth and Moon, or barycentre, that resides below the surface of the Earth. So what do we know about the new "planets"? Ceres is the largest object orbiting in the asteroid belt between Mars and Jupiter. It was recognised as a planet when it was first discovered in 1801. But because 19th century astronomers could not resolve the size and shape of this object, and because numerous other bodies were discovered in the same region, Ceres lost its planetary status. For more than a century, it has been referred to as an asteroid or minor planet. Ceres: regains the status it lost more than a century ago Ceres fits the new definition because it has enough mass for its own gravity to pull it into a nearly spherical shape. Charon was discovered in 1978 by James Christy, an astronomer at the US Naval Observatory in Washington DC. Until now, it has been regarded as a moon of Pluto. But both Pluto and Charon have enough mass to be spherical - both bodies independently satisfy the proposed definition of a planet. Pluto and Charon are being referred to as a "twin" planet because their common centre of gravity, or barycentre, is located in free space outside the surface of Pluto. 2003 UB313 was discovered by US astronomer Mike Brown and his colleagues at the California Institute of Technology three years ago. This year, measurements by the Hubble Space Telescope confirmed that it is larger than Pluto. Like Pluto, it is an icy body that orbits beyond Neptune in the Kuiper Belt. It is almost 10 billion miles from the Sun and more than three times more distant than Pluto. 2003 UB 313 Pluto takes more than twice as long to orbit the sun as Pluto. The name is a temporary one; the IAU must agree on an official one. Mike Brown's group have nicknamed the object Xena, after the TV warrior princess, and its moon Gabrielle, after the fictional character's sidekick. Does this mean the number of planets in the Solar System could rise even higher? Yes, it is almost certain to. Since the early 1990s, astronomers have spotted many new objects orbiting the Sun beyond Neptune - a feat made possible by advances in technology. The IAU has a "watchlist" of at least a dozen other potential candidates that could become planets once more is known about their sizes and orbits. These include Sedna, which could be the first object to be discovered in a hypothetical region of the Solar System known as the Oort Cloud, as well as several Kuiper Belt objects with comparable sizes to Pluto. Three asteroids - Vesta, Pallas and Hygiea - are also on the watchlist. Astronomers recently discovered two new satellites around Pluto. Does this make Pluto a quadruple planet? No. The two newly discovered smaller bodies in orbit around Pluto are too small and not massive enough for gravity to force them in to a spherical shape. They are satellites, even though the centre of gravity about which they orbit is located outside the surface of Pluto. |
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17-Aug-2006, 08:30 | #2 |
Member # 6
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Noticia d Ayer...
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17-Aug-2006, 08:32 | #3 |
Datsun
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LB120
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como seria vivir en venus? ha de ser verano eterno.....
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17-Aug-2006, 08:33 | #4 |
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Pluto no es planeta, es el perro de mickey va vos
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17-Aug-2006, 08:35 | #5 |
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todos los textos del sistema solar... y las rimas y canciones que nos enseñaron de pequeños para aprendernos los nombres de los planetas.....
de alli que la tierra es un astro del sol, y el sol es planeta de la via lactea... |
17-Aug-2006, 08:36 | #6 | |
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17-Aug-2006, 08:39 | #7 | |
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17-Aug-2006, 08:45 | #8 |
buscando infractores
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Pachuca Lada 1979
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que vergo de planetas nuevos, este rollo si me gusta....
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17-Aug-2006, 08:45 | #9 |
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no solo sino que :ciego: kadjsfklsdjlfasdjlkf
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17-Aug-2006, 08:49 | #10 |
<lol>
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INTERESANTE
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17-Aug-2006, 08:51 | #11 |
LA DIVA DE LOS PADROTES
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a la gran....a aprenderse de nuevo los planetas
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A REAL QUEEN OF PIMPS..!!! all the BITCHES works for me |
17-Aug-2006, 08:56 | #12 |
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Saturno, Urano, Neptuno y 2003 UB313
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17-Aug-2006, 08:58 | #13 |
See U on The Street
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Yo ya sabia
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17-Aug-2006, 08:58 | #14 | |
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17-Aug-2006, 09:01 | #15 |
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awebos Pluto no es planeta.... es un
kljsdflkjañdflkjasdlkfasdf pobres patojos a aprenderse en el colegio otro planetas....asdlñkfjalksdfñaldsad al rato va a resultar que Guate tiene mas departamentos
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No la manejo, la maltrato Ella cuida de mi y yo de ella jeep owner O [] [] [] [] O |
17-Aug-2006, 09:33 | #16 | |
R u Cool People?
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Cita:
dfjdshf sdfhkjs
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17-Aug-2006, 09:45 | #17 |
Waterwalker
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Que deahuevo este rollo, lo de Ceres ya medio lo había escuchado, e igual de un planeta más grande que Plutón y más lejos támbién
cool info mano
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Mickey ....
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17-Aug-2006, 12:37 | #18 |
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Lo que es no tener nada mas importante que hacer... total no podemos llegar a ninguno de ellos.
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17-Aug-2006, 12:40 | #19 |
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12 planetas, ta bien. Va mejorando el vecindario.
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