... Bad Astronomy . Misconceptions . ... Bad Astronomy : The Moon only shows one face to us because it is not rotating. Better astronomy : The Moon only shows one face because it is rotating, once every time it revolves around the Earth. ... Place the Moon model on the table about 30 centimeters (one foot) away with the X facing the Earth model. ... You'll see that to keep the X facing the Earth model, you have to rotate the Moon model as it goes around the Earth model . ... 2008 Phil Plait. ...

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• Phil Plait's Bad Astronomy: Bitesize Astronomy
• Phil Plait's Bad Astronomy: Mad Science
• Phil Plait's Bad Astronomy: Bitesize Tour of the Solar System

Astropark Home . Solar System . ... Planets . ... A year is the time that it takes for a planet to go around the Sun. ... As a result, an Earth year is very different in length from a year on Saturn or any other planet. ... But on this scale, most of the planets are too small to see, so their size has been increased by 200 times. ... The Astropark's red gravel represents the asteroid belt ? thousands of smaller bodies which range in size from pebbles up to small planets hundreds of miles across. ...

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• Extrasolar Planetary Systems: More Like Ours - by David Perez-Suarez, Armagh
• Armagh Astropark
• Human Orrery

... More on 51 Peg: . The discovery of a Jupiter--mass planet in orbit around the solar--type star 51Peg has been reported by Michel Mayor and Didier Queloz (Geneva Observatory) on October 6th at the 9th Cambridge workshop on "cool stars, stellar systems, and the sun" held at Florence (Italy). ... Recall that the measurements of radial velocity only yield v sin i which in turn gives us M sin i. For most values of i, sin i will be greater than 0.5 and this gives a mass estimate of 0.5 Jupiter masses. ...

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• http://zebu.uoregon.edu/51peggm.html
• Astronomy HyperText Book: Planetary Motion

... Planets . ... Earth Satellites . ... The newly discovered ?mega-Earth? ... Its sibling, the lava world Kepler-10b, is in the background (the two planets? proximity is grossly exaggerated) .?а Kepler-10c has a diameter of about 29 000 km, 2.3 times as large as Earth, and weighs 17 times as much. ... The first mega-earth to be discovered is Kepler-10c which orbits a star lying about 560 light years from the Sun in the constellation Draco. ... Astronomers Find a New Type of Planet: The ?Mega-Earth? ...

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• Rings Around an Asteroid | Astronotes
• Kepler 36b and c: Too Close for Comfort | Astronotes
• Kepler-11: a strange and crowded planetary system | Astronotes

... Credit: Greg Bacon ( STScI ), NASA Explanation: The last decade saw the profound discovery of many worlds beyond our solar system, but none analogs of our home planet Earth . Exploiting precise observational techniques, astronomers inferred the presence of well over two dozen extrasolar planets , most nearly as massive as gas giant Jupiter or more, in close orbits around sun-like stars. ... Publications with keywords: extrasolar planet - planet - Saturn - planetary system . ... Crescent Saturn . ...

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• Астронет > Saturn-Sized Worlds Discovered
• Астронет > Notes for PSR 1257+12
• Journal "Peremennye Zvezdy"

... Indeed, one alteration of orbits can be the outright ejection of a planet. When several big planets are orbiting a star under each other's influence, the system is inherently unstable. ... We know of no good reason why the smallest objects with fusion should have the same mass as the smallest objects that can form by themselves. ... 6) Mission Definition . ... I don't think this mission is impossible, and will suggest a definition in a future article in Mercury. ... Good luck! . ...

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• ASP: A Flag for Mars
• ASP: The Music of the New Spheres?
• ASP: Up, Up, and Away

... Science User Portal . ... For the first time, astronomers have been able to directly follow the motion of an exoplanet as it moves from one side of its host star to the other. ... Only 12 million years old, or less than three-thousandths of the age of the Sun, Beta Pictoris is 75% more massive than our parent star. ... This research was presented in a paper to appear this week in Science Express (тАЬA Giant Planet Imaged in the disk of the Young Star Beta Pictoris,тАЭ by A.-M. Lagrange et al.) ...

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• Orbits of the Planets | ESO
• Mario van den Ancker
• Orbits of the Planets | ESO Ireland

... Gallery . ... Mars . ... Sidebar Left . Sidebar Top . No Sidebar . Sidebar Bottom . Sidebar Right . ... Title: Deimos orbiting Mars . ... In the animation, Deimos is moving along its orbit around Mars. Each frame is around 10 minutes apart. NOTE: All images and movies are copyright and must not be reproduced or mirrored in any form without written permission. ... Deimos orbiting Mars An over-exposed Mars and one of its moons, Deimos (faint spot in lower-left quadrant). ...

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In ancient times the solar system was thought to be the whole Universe, so the study of planetary motions was cosmology. ... The planets other than the Moon and Sun generally move West to East through the stars, but occasionally stop and move in the opposite direction ( retrograde motion). In order to explain the retrograde motion of the planets, the geocentric model of the Solar System shown above puts the planets on small circles called epicycles . ...

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... The study of extra solar planets will be one of the most important areas of research in astronomy in this century. ... The first planets outside the solar system were found in 1992 around the millisecond pulsar PSR B1257+12 by Alex Wolszczan at the Arecibo Observatory . ... Three space missions based on this principle (MOST, COROT and Kepler ) have already been launched or approved, and have the last one at least has the potential to find Earth-sized planets. ... SIM ( NASA ) is one of such missions...

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On the inclination of planetary orbits! Caroline Terquem! ... Planets on inclined orbits Higher inclinations for planets around stars with Teff>6250K? Planet formation, Hot Jupiters and misalignments 1. If planets form by the core accretion scenario and migrate in: Hot Jupiters But no eccentricity and no misalignment (if the disc is in the star's equatorial plane) With further planet/planet scattering and/or Kozai cycles: Eccentricity and misalignment But companions required.. ...

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• http://www.mrao.cam.ac.uk/wp-content/uploads/2014/04/AMustill.pdf
• Astrophysics Group Research and Instrumentation

... Tonight's Sky . ... DISK т?? ... Sky this Month . ... Star Atlas . ... A planet is forming in an Earth-like orbit around a young star . New images reveal never-before-seen details in the planet-forming disk around a nearby Sun-like star, including a tantalizing gap at the same distance from the star as Earth is from the Sun. ... ALMA image of the planet-forming disk around the young Sun-like star TW Hydrae. ... Disks of dust and gas that surround young stars are the formation sites of planets. ...

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• Planets, orbits, and comets are somewhat round. Is there an underlying
• Would it be possible to find a moon around an extrasolar planet? If so, how? |
• NASA's newest Mars mission spacecraft enters orbit around the Red Planet |

Project B - Producing an Unbiased Study of the Spheres of Influence of 1 Solar Mass Stars. For planets in orbit around solar-like stars, 4 mas is needed to probe an adequate volume of one million cubic parsecs (0.5 AU orbits at 100 parsec distance). ... The filled aperture is needed because, once again, a systematic attack on the issue of spheres of influence is needed to encompass not particular, known cases of disks, jets and orbiting rocks, but all of the above in a fair sample of all stars. ...

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• Research Interests
• STScI Star and Planet Formation Seminar Series

... 8, ``Celestial Mechanics'', 2002 Regularity and chaos for planetary orbits in binaries D. Benest Observatoire de Nice, Nice, France 1. ... Previous papers showed that stable planetary orbits, around either the lightest or the heaviest component of several nearby binary systems, exist up to distances from their primary of the order of more than half the binary's periastron sepґ aration. ... Chaos: bounded or sticky? It is now wellґknown that planetary dynamics may include some proportion of chaos. ...

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• http://www.ipa.nw.ru/conference/2002/sovet/PS/SOKOL_L.PS
• ENGAMPLE
• (Untitled)

Uranus: around the Sun, "lying in the side". Uranus . ... Mass . ... The period of rotation . ... The average distance from the Sun . ... Excentricity of the orbit . ... Uranus is the seventh from the Sun great planet of the Solar system. ... The theoretical model of Uranus structure is following its upper layer is a gasoliquid shell under which is an icy cloak (the water and ammonia ice) then comes the core of the solid soils. The cloak and the core mass is about 85-90% of all Uranus mass. ...

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• saturne
• Keplere
• plutone

... Neptune is smaller in diameter but larger in mass than Uranus . ... N eptune has been visited by only one spacecraft, Voyager 2 on Aug 25 1989. ... A t the time of the Voyager encounter, Neptune's most prominent feature was the Great Dark Spot (left) in the southern hemisphere. ... Neptune's winds blew the Great Dark Spot westward at 300 meters/second (700 mph). ... L ike Uranus and Jupiter, Neptune's rings are very dark but their composition is unknown. ... Neptune's Ring System . ... Uranus .. ...

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• The Path of the Sun, the Ecliptic
• Lagrangian Points
• Solar system [Oulu]

Discover the cosmos! ... 2002 June 14 . 55 Cancri: Familiar Planet Discovered . ... The discovery of a Jupiter -like planet in a Jupiter-like orbit around nearby Sun -like star 55 Cancri , announced yesterday, gives a new indication that planetary systems similar to our Solar System likely exist elsewhere. The planet, discovered by G. Marcy ( UC Berkeley ) and collaborators, is one of two new planets found around 55 Cancri -- in 1997 a Jupiter-massed planet was found orbiting very close in. ...

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• APOD: November 3, 1997 - Irregular Moons Discovered Around Uranus
• APOD: January 31, 1996 - Planets Around Sun-Like Stars
• APOD: 2009 June 3 - VB 10: A Large Planet Orbiting a Small Star

God Science Forum Message . ... God and Science | ... Pluto Is Not A Planet, But A Moon Of Neptune. ... Pluto Is Not a Planet, but a Moon of Neptune . 60 years ago, at 1947, the late Mohammed Ali Hassan Al-Hilly, said in his book: (The Universe and the Quran), that Pluto is not a planet but a moon of Neptune. ... He said: " Astronomers, however, think that Pluto is a planet, but I say it is merely a moon of Neptune, and actually it is not a planet. ... www.astronomy.net . About Astronomy Net | ...

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• Astronomy articles, forums, listings, and other resources about Astronomy.
• Moon, Planets And Aurora, Oh My! - an Astronomy Net Article
• Lunar Libration - an Astronomy Net Article

... The apparent path of the Sun across the sky. ... Like the planets, the Sun, too, moves around the zodiac, making one complete circuit each year. ... In one year, as the Earth completes a full circuit around the Sun (drawing above), the Earth-Sun line and its continuation past Earth sweep the entire plane. ... Since the Sun and Earth are in the plane of the ecliptic, the line is automatically in that plane too; if the moon is also on the same line, it must be in the plane of the ecliptic as well. ...

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• Spacecraft that Explore Distant Space
• Lagrangian Points
• Kepler's First Law--Lesson Plan #20

... Neptune is smaller in diameter but larger in mass than Uranus . ... An international dispute arose between the English and French (though not, apparently between Adams and Le Verrier personally) over priority and the right to name the new planet; they are now jointly credited with Neptune's discovery. ... A t the time of the Voyager encounter, Neptune's most prominent feature was the Great Dark Spot (left) in the southern hemisphere. ... more Neptune images . ... What happened to the Great Dark Spot...

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• Sun, Planet and Satellite Data
• Voyager
• What is a Comet?