... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Risks Comparable to NEOs . ... The Increasing Rate of Discovery of Asteroids . ... Comet and Asteroid Collision Probabilities . ... Extreme albedo comets and the impact hazard (PDF Format) . ... Asteroid Impact Animations . ... Workshop on Scientific Requirements for Mitigation of Hazardous Comets and Asteroids - 2002 . ... The Spaceguard Survey Report, 1992 (PDF) . Tsunami from Asteroid/Comet Impacts . ...

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. ...

... A Large Space Station Over Earth . ... 14.04.2010 . ... Credit Copyright: STS-131 Crew, Expedition 23 Crew, NASA Explanation: The International Space Station is the largest object ever constructed by humans in space. ... The station is so large that it could not be launched all at once -- it is being built piecemeal with large sections added continually by flights of the Space Shuttle . ... April . ... 2009 2010 . ... Publications with keywords: ISS - Earth . Publications with words: ISS - Earth . ...

... 2010 April 14 . A Large Space Station Over Earth . Credit: STS-131 Crew, Expedition 23 Crew, NASA . Explanation: The International Space Station is the largest object ever constructed by humans in space. ... The station is so large that it could not be launched all at once -- it is being built piecemeal with large sections added continually by flights of the Space Shuttle . ... On the far right, a crescent Earth slices through the blackness of space. ... About APOD | ...

... 142,800 Mean density (kg/m^3) .. ... 5.203 Rotation period (length of day in Earth hours).. 9.8 Revolution period (length of year) (in Earth years). 11.86 Obliquity (tilt of axis) (degrees).. 3.08 Orbit inclination (degrees).. 1.3 Orbit eccentricity.. 0.048 Mean surface temperature (K)........................ 120 (cloud tops) Visual geometric albedo.. 0.44 Atmospheric components.............................. 90% hydrogen, 10% helium, .07% methane Rings.. ...

... Tonight's Sky . ... Observing . ... Sky this Month . ... Observing Podcasts . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... Seasonal Observing . ... How massive must a colliding body be to disturb Earth's orbit? ... 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...

. Previous slide . Next slide . Back to first slide . View graphic version .

... Staff Directory . ... Colloquia . ... Events . ... Previous studies suggest that the planet-forming disks around very-low-mass stars/brown dwarfs may be flatter than those around more massive stars, in contrast to model predictions of larger scale heights for gas-disks around lower-mass stars. ... We find that relative to the disk structure predicted for flared disks the required reduction in disk scale height is anti-correlated with the stellar mass, i.e. disks around lower-mass stars are flatter. ...

... ESO is building what will be the World's largest optical telescope array, The Very Large Telescope (VLT). The VLT Project organisation is responsible for the design and construction of the Unit Telescopes, including enclosures, optics, adapter-rotators and coating unit. ... Unit Telescopes Overview - This page is outdated, an update is in process. ... Secondary mirror (M2 Unit) - This page is outdated, an update is in process. ... Coating Unit - This page is outdated, an update is in process. ...

... Earth is the tiny spot between Jupiter and the Sun). ... Distance Radius Mass Name Orbits (000 km) (km) (kg) --------- ------- -------- ------- ------- Sun 697000 1.99e30 Jupiter Sun 778000 71492 1.90e27 Saturn Sun 1429000 60268 5.69e26 Uranus Sun 2870990 25559 8.69e25 * Neptune Sun 4504300 24764 1.02e26 * Earth Sun 149600 6378 5.98e24 Venus Sun 108200 6052 4.87e24 Mars Sun 227940 3398 6.42e23 Ganymede Jupiter 1070 2631 1.48e23 + Titan ... Extrema .. ...

Software Forum Message . ... Astronomy Software Discussion | ... Starry Night Pro Plus 6 - How Do I Enter Large Asteroid Database . ... The starry night pro asteroid.txt file is confusing. ... I have downloaded a page of Near Earth Asteroids from the Nasa website but I'm not sure what format starry night requires. ... www.astronomy.net . About Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

Metis . Jupiter XVI - 1979J3 . Metis [MEE-tis] is the innermost known satellite of Jupiter. ... Metis and Adrastea lie within Jupiter's main ring and may be the source of material for the ring. ... Galileo Image of Metis . ... Although Metis was discovered by Voyager, it was no more than a point of light on images. This Galileo image is the the first image of the small moon that shows its irregular shape. ... The longest dimension of Metis is approximately 60 kilometers (37 miles) across. ...

Image credit: Michael Nolan, Arecibo Observatory. These radar images of near-Earth asteroid 2001 SN263 were obtained on 2008 Feb 12 and 13. ... Image from Feb 12 . ... First near-Earth triple asteroid discovered by Arecibo Observatory . ... was discovered this week by astronomers at the sensitive radar telescope at Cornell University?s Arecibo Observatory in Puerto Rico. ... For example, Arecibo has discovered more than half of the near-Earth binary asteroid systems discovered since 1999. ...

... One of this year's largest mass ejections from the Sun's atmosphere was recorded last Sunday by TESIS telescopes aboard the CORONAS-PHOTON satellite ( video - wmv 4.3 MB ). ... Over the course of a week, two gigantic solar prominences were simultaneously ejected from the surface of the Sun. ... Earth will not feel the Sun's influence either. ... The TESIS observatory ї TESIS: www.tesis.lebedev.ru . ... One of this year's largest mass ejections from the Sun's atmosphere (movie WMV, 4.3 MB) . ...

... Creation of Space transportation system on the base of large length rope utilization . ... A given address contains the proposal to equip the International Space Station with the long rope and to create on that base a Space transportation system. ... A given system has the multifunctional purpose. ... The rope system could be the base for creating of alternative system of station angular orientation. To utilize the rope system to launch small satellites from the station and to return them back. ...

... Asteroid . ... In case you didn't hear about it, which you probably didn't: On Jan. 7, an asteroid 1,000 feet across -- nearly three times the current diameter of Marlon Brando -- barely missed the Earth, which is most likely your planet of residence. ... What if this asteroid had hit the Earth? ... As it happens, the American Astronomical Society was holding a conference in Washington AT THE VERY SAME TIME as the asteroid nearly hit the Earth. ...

Next: Ejectors in Massive Binary Previous: Artificial Galaxy: Full Matrix . The first version of the Scenario Machine was aimed especially at the simulation of massive binary star evolution. ... First, there is a large class of intermediate mass binaries (say, consisting initially of 8 + 5 solar masses) that can also produce NS and thus lead to the formation of a bright X-ray source. ... Next: Ejectors in Massive Binary Previous: Artificial Galaxy: Full Matrix Mike E. Prokhorov . ...

... Posts tagged ?Earth? ... Posted by vlk . There is a new report from Bernabei et al. ( arXiv:0804.2741 ) of the direct detection of the effects of Dark Matter that is causing a lot of buzz. ... Category: arXiv , News | 2 Comments . ... Tags: astrostatistics , curve fitting , Earth , ellipses , epicycles , Galileo , history , inference , iTunesU , Kepler , Mars , Owen Gingerich , planetary motion , Ptolemy , Quotes . ... Entries RSS . Comments RSS . ... Entries (RSS) and Comments (RSS) . ...

... Posters & Exhibits . Special Events & 2011 Awards Banquet . ... Waleed Abdalati speaks about "Looking Homeward Toward Earth" at the plenary session . ... Workshop participants put together sun funnels . ... Participant in "Exploring Transiting Extrasolar Planets" workshop . ... Participant in Year of the Solar System workshop . ... Marni Berendsen and Anna Hurst Schmitt lead the "Finding Science in the Night Sky" workshop . ... Douglas Duncan, recipient of the Emmons award, with Jeanne Bishop . ...

... Search . Email & phone search . ... Astrophysics Group . ... Galaxy Formation and Evolution . Highlights & News . ... Main Projects . ... PhD Thesis Projects . ... 2013, Astrophysics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0HE . ...