... A Planet Transits the Sun . ... A Venus crossing, called a transit, last occurred in 1882 and was front-page news around the world. Mammatus Clouds Over Mexico . ... Can you spot the planet? ... An artist's dramatic vision, the picture shows the Sun suspended above the nearby horizon as a bright star immersed in the dusty ecliptic plane. ... Winds from massive stars and blasts from supernova explosions have created a billowing cloud of expanding gas from this remarkable starburst galaxy. ...

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... Bad Astronomy . ... Bitesize Astronomy . ... Last week's Snack talked about how black holes can affect the environment around them in such a way as to be very bright . ... It's a common misconception that black holes always have matter swirling into them. ... As this matter gets closer and closer to the black hole it piles up and a large, fairly flat disk forms. This is called the accretion disk , because matter from this disk accretes (that is, falls in) on the black hole. ... 2008 Phil Plait. ...

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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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• Dust disk around a black hole in galaxy NGC 7052
• HST this week: 064

... 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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• Orbital Properties of the Solar System
• Astronomy HyperText Book: Interstellar Medium

... 2008 December 19 . The Large Cloud of Magellan . ... As a result, two fuzzy cloud-like objects easily visible to southern hemisphere skygazers are known as the Clouds of Magellan , now understood to be satellite galaxies of our much larger, spiral Milky Way galaxy. About 160,000 light-years distant in the constellation Dorado , the Large Magellanic Cloud (LMC) is seen here in a remarkably detailed, 10 frame mosaic image . ... About APOD | ... NASA Web Privacy Policy and Important Notices . ...

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• APOD: 2008 December 3 - A Happy Sky Over Los Angeles
• APOD: 2008 December 1 - Massive Stars Resolved in the Carina Nebula
• APOD: 2009 December 15 - A Fading Moonset Over Hong Kong

Armagh Observatory, 28 May 2004: A very rare astronomical event occurs during the morning of the 8th June this year, when the planet Venus crosses the face of the Sun. During the event, known as a 'transit of Venus', the Earth's 'sister' planet Venus will appear as a small black disc, about one thirtieth the diameter of the Sun. The last transit of Venus occurred nearly one hundred and twenty-two years ago, in December 1882. ... Last Revised: 2004 June 4th . ...

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• Geminid Meteors
• Extrasolar Planetary Systems: More Like Ours - by David Perez-Suarez, Armagh
• May 2002 Planetary Alignment

Astronotes Armagh Planetarium's Stellar Blog! ... Solar System . ... Planets . ... This bizarrely shrunken planetary system was found by NASAтАЩs Kepler mission, hence the parent star has been named Kepler-11. ... Planetary scientist and Kepler science team member Jack Lissauer said ?These six planets are mixtures of rock and gases, possibly including water.тАЭ €аNone of these strange new worlds are likely to be home to any form of life; their surface conditions are simply too extreme. ...

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• See giant planet Jupiter tonight | Astronotes
• Kepler-10c: the First Mega-Earth | Astronotes
• Exoplanet HAT-P-1b: weird, warm and fuzzy | Astronotes

3) Planets and Brown Dwarfs . ... By its nature, this method is most sensitive to massive planets orbiting close to their stars. ... That means that some of the more massive extrasolar planets could actually be brown dwarfs (although the statistics of the finds suggest that most of them are not). ... Another possible difference between brown dwarfs and massive planets is how they are born. ... They would base the fundamental definition on the mode of formation: a planet is built from planetesimals. ...

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• ASP: Astronomy Behind the Headlines
• ASP: Monster Comet Promises Big Show
• ASP: The Search for Planets Around Other Stars

... 1999, A , 350, 917 . ... Shock heated NH3 in a molecular jet associated with a high-mass young star . ... 1999, ApJL, in press . ... 1999, A , in press . ... 1999, in "The First Stars", eds. A. Weiss, T. Abel and M. Norman, in press . The formation of primordial stars . ... 1999, in "Star Formation 1999", ed. T. Nakamoto, in press . ... T. Jacq, A. Baudry, C.M. Walmsley, P. Caselli . ... 1999, ApJ, in press . ... Star Formation . ... Osservatorio Astrofisico di Arcetri . ... Star Formation Group . ...

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• Galileo Crosses Boundary Into Jupiter's Environment
• Hubble Uncovers Dust Disk Around a Massive Black Hole (STScI-PRC98-22) A
• Neptune's Moon Thalassa

NASA's Galileo spacecraft radioed confirmation late this week that it has entered Jupiter's environment, crossing over the boundary from interplanetary space into the giant magnetic cocoon around Jupiter called the magnetosphere. ... On Thursday, December 7, Galileo's previously deployed atmospheric probe will plunge into Jupiter's cloud tops at 5:56 p.m. EST and descend into the giant planet on a parachute. ... Jupiter's magnetosphere is like a giant bubble around the planet. ...

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• Neptune
• Earth Introduction
• Other Solar Systems

... Tonight's Sky . ... Observing . ... Sky this Month . ... Astronomy for Kids . ... Can you explain Mercury's retrograde motion? Do other planets appear to do this also? ... When astronomers talk about retrograde motion, generally they refer to the apparent motion outer planets make as Earth passes them while orbiting the Sun. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

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• Astronomy Magazine - Interactive Star Charts, Planets, Meteors, Comets,
• New discoveries suggest low-mass planets are common around nearby stars |
• Nearby failed stars may harbor planet | Astronomy.com

... Search . ... Astrophysics Group . Research . ... Research and Instrumentation . ... While this seems an extraordinary endeavour, in light of what we have learnt about Solar System planets, only a handful of key ingredients are required to start characterising an exoplanet. ... The NGTS project is a partnership between the University of Cambridge, Queen?s University Belfast, University of Warwick, University of Leicester, Observatoire de Geneve, DLR (Berlin) and Universidad Catolica de Chile. ...