... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... A year is the time that it takes for a planet to go around the Sun. ... However, this period of time varies according to how far from the Sun the planet is: the further out, the longer the year. ... Squeezing Space - scaling the solar system . ... Asteroids . 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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• Human Orrery

Astronotes Armagh Planetarium's Stellar Blog! ... Solar System . ... Moon . ... Comets and Asteroids . ... What changed our view of Chariklo is the discovery of a ring system around it, the first such feature found around a Solar System body smaller than a gas giant planet. ... Almost certainly the rings were born when a collision with a smaller asteroid blasted millions of tonnes of debris off CharikloтАЩs surface. ... A ring system detected around the Centaur (10199) Chariklo (Braga-Rigas et al.) ...

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• Astronotes | Armagh Planetarium's astronomy news from across the Universe -
• Kepler-10c: the First Mega-Earth | Astronotes
• Exoplanet HAT-P-1b: weird, warm and fuzzy | Astronotes

... 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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• Astronomy Plus CCD Images of Galaxies

... Is this image worth a thousand words? ... A great grouping of planets is now visible to the west just after sunset. ... Still catching the Sun's rays, the International Space Station (ISS) cruises across the early evening sky above Tomahawk, Wisconsin, USA. ... Gazing across this gorgeous skyscape, the Southern Cross and stars of the constellation Centaurus are seen above the outline of Mauna Loa (Long Mountain), planet Earth's largest volcano. ... Comet and Aurora Over Alaska . ...

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... General information . ... Staff . Research staff . ... Information . ... Historical highlights . Historical research . ... This process is thought to occur in circumstellar disks of gas and dust around young stars on rather short timescales : infrared surveys show that the number of low mass stars with disks drops dramatically for stars older than 10 Myr, suggesting that in order to form large solids before the disk disperses, the growth process has to take place within a few million years. ...

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• INAF - Arcetri Astrophysical Observatory
• What is a Comet?
• Galileo Crosses Boundary Into Jupiter's Environment

My research efforts have focused on three areas which are: . More than 200 extrasolar planets have been discovered around relatively nearby stars, primarily through the Doppler line shifts owing to the reflex motions of their host stars, and more recently through transits of some planets across the face of the host stars. ... Gravitational microlensing provides a novel technique to look for planets around lens stars, and this is the only technique currently capable of detecting Earth-mass planets. ...

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• Producing an Unbiased Study for the Spheres of Influence of 1 Solar Mass Stars
• Planets and Infrared Excesses: Preliminary Results from a Spitzer MIPS Survey

... Bringing news from across the Universe to children all around the world . ... Astronomers have captured this amazing new space photograph showing the birth of a Solar System! Earth and the other seven planets of our Solar System are not alone in the Universe. Over 1800 planets have been discovered around distant stars so far, and this number is rising! Stars and planets form when a giant cloud of cosmic dust in space collapses in on itself. ...

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• http://www.eso.org/public/news/eso1144/kids/
• http://www.eso.org/public/news/eso1529/kids/
• http://www.eso.org/public/news/eso1204/kids/

... 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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... 2006 August 28 . Eight Planets and New Solar System Designations . ... Explanation: How many planets are in the Solar System? This popular question now has a new formal answer according the International Astronomical Union (IAU): eight. Last week, the IAU voted on a new definition for planet and Pluto did not make the cut. ... The eight planets now recognized by the IAU are: Mercury , Venus , Earth , Mars , Jupiter , Saturn , Uranus , and Neptune . ... About APOD | ...

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• APOD: January 31, 1996 - Planets Around Sun-Like Stars
• Uranus' New Moons
• APOD: 2008 September 3 - 31 Million Miles from Planet Earth

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
• Alignment Of 2 Planets - an Astronomy Net Christstar Forum Message

... Bad Astronomy . ... Bitesize Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... It's semi-common knowledge that stars twinkle and planets don't. By semi-common, I mean that a lot of folks know that, but I also mean it isn't strictly true. Stars twinkle because we see them from the bottom of a sea of air. ... These small bundles of air act like little lenses, bending light as it passes through them. ... What we see is the light from the star flickering. ...

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• Phil Plait's Bad Astronomy: Misconceptions: James McCanney's Nonsense
• Phil Plait's Bad Astronomy: Bad News:
• Phil Plait's Bad Astronomy: Misconceptions

... Tonight's Sky . ... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Moon . ... Observing . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... Would it be possible to find a moon around an extrasolar planet? ... Get instant access to subscriber content on Astronomy.com! ... If you are already registered on Astronomy.com, please log in below. ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

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• The Milky Way contains at least 100 billion planets according to survey |
• Astronomy Magazine - Interactive Star Charts, Planets, Meteors, Comets,
• A planet is forming in an Earth-like orbit around a young star | Astronomy.com

... 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
• The Path of the Sun, the Ecliptic --lesson plan #3
• Discovery of the Solar System

... Venus" in Astronomy , Sep. 1982, p. 6. ... The Solar System Close-Up (130 of the best spacecraft views of the planets and satellites. with detailed nontechnical captions) ? ... Activity Corner: "Scaling Down The Solar System" . ... On this scale, the Earth would be represented by a pea, and the Moon by a grain of sand 13 cm. away. ... You could make the scale ten times smaller, so that the solar system would fit within the school yard, but then the Earth would shrink to the size of a grain of sand. ...

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• ASP: A Good Definition of the Word "Planet": Mission Impossible?
• ASP: Astronomy in the News
• ASP: Miranda: A Jigsaw Puzzle World

The apparent path of the Sun across the sky. ... The path of the Sun across the celestial sphere is very close to that of the planets and the moon. ... 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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• Discovery of the Solar System
• Solar system [Oulu]
• Mercury

... This year's eclipse is unique in duration. ... Although, at the present time, there are 6 solar observatories belonging to leading space agencies in orbit around the Earth, the eclipse of 22 July, 2009, will only be seen by two of them: the Russian CORONAS-PHOTON satellite equipped with TESIS telescopes and Japan's HINODE satellite fitted with an XRT space telescope. ... TESIS will be the first of the two devices (and the very first on Earth) to witness the solar eclipse. ...

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• Project's diary

Here are some World Wide Web links which are related to those topics found in Chapter Five: . The Nine Planets . The Solar System . Comprehensive lists of planet facts . Up to date representation of the solar system . Ringed planets . ... NASA`s solar system exploration site . The Voyager Spacecraft . The Galileo Spacecraft . The Magellan Spacecraft . Spacecraft Images . New planet around 51 Pegasus . ... Back to Chapter Five ...

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• Eyes on the Sky, Feet on the Ground: WWW links

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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Galushina T., Bykova L., Letner O., Baturin A. Tomsk State University Russia 1 Investigation Dynamics Asteroid of of 2 Solving problems construction of numerical model of asteroid motion with account chosen perturbed factors; asteroid orbit improvement according to positional observations; construction of initial probabilistic domain by linear and nonlinear methods; study of evolution of initial probabilistic domain; revealing of ...

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... малой планете . ... на основании решения от 9 мая 2001 года . Комитета по наименованию малых планет . ... что малая планета, . зарегистрированная в международном каталоге малых планет . под N 11438 и имеющая предварительное обозначение 1973 QR1, . ... ZELDOVICH . ... Якова Борисовича Зельдовича . ... 11438) Zeidovich = 1973 QR1 . ... Малая планета (11438) Zeidovich открыта 29 августа 1973 г. Т.M.Смирновой в Крымской астрофизической обсерватории. ... Циркуляр Малых Планет N 42672, 2001. ...

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