... Mammatus Clouds Over Mexico . ... Normal cloud bottoms are flat because moist warm air that rises and cools will condense into water droplets at a very specific temperature, which usually corresponds to a very specific height. After water droplets form that air becomes an opaque cloud. Under some conditions, however, cloud pockets can develop that contain large droplets of water or ice that fall into clear air as they evaporate. ... NASA Web Site Statements, Warnings, and Disclaimers . ...

... 2004 June 7 . Mammatus Clouds Over Mexico . ... Normal cloud bottoms are flat because moist warm air that rises and cools will condense into water droplets at a very specific temperature, which usually corresponds to a very specific height. After water droplets form that air becomes an opaque cloud. Under some conditions, however, cloud pockets can develop that contain large droplets of water or ice that fall into clear air as they evaporate. ... About APOD | ... NASA Official: Jay Norris. ...

... 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. ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. August 18, 1999 . Sun Block . ... Explanation: During a total solar eclipse, Earth's moon blocks the sun - almost exactly. While the sun is about 400 times wider than the moon, it is also about 400 times farther away and each appears to be half a degree or so in diameter. ... Tomorrow's picture: Light From The Dark Sun . ... About APOD > . ...

... self-absorption - the absorption of light shining on an object by a process similar to that which produced the light originally; if a cloud emits less light than it absorbs from other clouds behind it, this net loss of light, termed self-absorption , causes the foreground cloud to appear darker than the background field (the term is from spectroscopy, where small absorption dips sometimes occur in larger emission lines, making the latter look as if it is absorbing part of itself) . ... HISA Main ...

... Circumstellar disc of beta Pictoris: constraints on grain properties from polarization. To appear in the Astronomy & Astrophysics . abs , src , ps ] . ... Dust influx to Titan from Hyperion . ... abs ] . ... Characteristics of bulges and disks in interacting galaxies . ... Dust grains around Herbig Ae/Be stars: porous, cometary-like grains? ... To appear in the Astronomy & Astrophysics Supplement . ... Finally, Links may lead you to more options (e.g. via the LANL preprint system). ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . Noctilucent clouds as photographed by Mark Bailey from Lisdoart on 14th July 2006 at 11.30 pm. ... These so-called noctilucent (night glowing) clouds (NLCs), are formed by sunlight reflecting off ice crystals high in the atmosphere, and usually appear in the northwest, through north to northeast during twilight in the late spring and summer months at our latitude. ...

... Armagh Planetarium . ... Universe . ... Continue Reading.. ... 2 Comments After entering the Twittersphere in 2010 Armagh PlanetariumтАЩs online presence has grown over the past few years encompassing the Astronotes blog and Facebook accounts. ... No Comments In July 2015 Belfast Met opened its doors to budding astronauts, pilots and app geniuses with a new series of STEM summer camps. ... Here you will find the latest news and views from the fascinating worlds of astronomy and space exploration. ...

Astronomy Discussion Forums . ... Atm ћ Astrophotography ћ Blackholes ћ Blackholes2 ћ CCD ћ Celestron ћ Domes ћ Education . ... New Model: How Do The Sun And Moon Appear To Move Across The Sky . ... Post Message | ... focused on the Sun and the Moon as they appear from the given location of the Earth surface: . ... 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" . ...

Last modified: 17 April 1999 . ... V codes are for AO1 experiments W codes are for AO2 experiments VS experiment codes are VSOP Survey Observations VT Test/Calibration Observations ------------------------------------------------------------------------ EXPNO SOURCE FRQ Corr DOY DY: DATE UT RANGE #TEL TELESCOPES W088b1 J1229+02 L* Socr 105 Th:Apr-15 00:00 - 09:00 14 VLBA RO GO EB JB W077a W066a1 J0841+70 L Socr 107 Sa:Apr-17 13:00 - 00:00 8 NT BR OV SC HN TR NL KA W066b1 J0841+70 C ...

... Posts tagged ?IMF? ... Posted by hlee . ... Continue reading ?[ ArXiv] 1st week, Apr. ... This week, instead of only filtering AstroStatistics related papers from arxiv, I chose additional arxiv/astro-ph papers related to CHASC folks? astrophysical projects. ... Due to the CHACS? long history (we are celebrating the 10th birthday this year) and my being a newbie to CHASC, I may not pick up all papers related to the projects of current, former, and future CHASC members and dedicated slog readers. ...

... The awsome spectacle of a brilliant comet, with its long ghostly tail streaming behind it, is a rare event. ... Only one other comet, Comet Halley, was seen so far from the Sun, giving scientists an opportunity to watch it as it slowly warmed up and sprouted a tail. ... Comets are the Rip Van Winkles of the solar system -- mini-worlds that have changed little during their 4.5-billion-year nap far from the Sun. ... Observing Comets . ... Once, comets inhabited the entire solar system. ...

SMOV still under way, but science observations being made. ... In addition, a subset of the cluster was targeted for deep HST observations with ACS and NICMOS in Cycle 13, while WFPC2 was used recently to search for evidence for disks and jets among the lower-mass memebrs. ... The present observations build on the Cycle 13 program by providing second-epoch data that will allow separation of cluster and field to apparent magnitudes that correspond to masses as low as 3 M Jupiter for cluster members. ...

... This beautiful new image shows a glowing cloud of cosmic dust sitting boldly against a backdrop of shining stars. To the naked eye, thick clouds like these appear empty and dark, but some are actually home to the brightest nebulae and hottest young stars in the Universe! Stars are made of gas, so it is no surprise that they are born inside thick, gassy clouds. But the clouds that give birth to stars also block our view of them growing within. ...

... The State that has the highest rate of usage of ethanol as an alternative fuel . ... The last time the Oregon Ducks beat UCLA in basketball . The participants and score of the 1980 Rose Bowl . ... An Image of Issac Newton . ... The second highest paid player in the NBA last season . ... A map of the dams that comprise the British Columbia Hydropower System . ... The current freeway traffic flow in Seattle Washington . An image of a 1966 Shelby (Mustang) . ... Dr DarkMatter's Home Page . ...

... Today this year's largest group of sunspots will cross the Sun's central meridian. ... The next day, the number of spots in the group reached five, and the day after, on June 2nd, it was possible to count thirteen sunspots on solar disk, which had been clear prior to this. ... This year's two most powerful active areas, which passed across the solar disk at the beginning of May, 2009, are set to appear in the Sun's eastern sector in two days, on June 6th. ...

Title: A Dark-Matter Spike at the Galactic Center? Authors: Piero Ullio , HongSheng Zhao , Marc Kamionkowski . ... Title: The Galaxy Environment of Quasars in the Clowes-Campusano Large Quasar Group at z~1.3 . ... Title: The Galaxy Environment of a Quasar at z=1.226: A Possible Cluster Merger . ... 16 matches for the search pattern galaxy environment . The URL for this page is: http://xxx.itep.ru/find/astro-ph/1/galaxy+environment/0/1/0/past,all/0/0 www-admin@xxx.lanl.gov ...

... GSAOI Home . ... Picture Gallery . ... NIFS Cryostat and integration frame, as GSAOI will appear . NIFS cryostat, as GSAOI will appear . Cryostat in integration frame . Optical layout . ... Mechanical layout . ... Input beam splitter . ... Instrument integration ...

... In the US and in other mid-latitude countries north of the equator (e.g those of Europe), the sun's daily trip (as it appears to us) is an arc across the southern sky. ... Moss avoids direct sunlight, and with the sun's path curving across the southern sky, the north side of a tree-trunk is the one most shaded. ... In addition, they are invariably tilted at an angle around 450, to make sure that the arrival of the sun's rays is as close to perpendicular as possible. ...

Nearly a million ultraviolet sources appear in this mosaic of the Large Magellanic Cloud, which was assembled from 2,200 images taken by Swift's Ultraviolet/Optical Telescope. The 160-megapixel image required a cumulative exposure of 5.4 days. The image includes light from 1,600 to 3,300 angstroms тАФ UV wavelengths largely blocked by Earth's atmosphere тАФ and has an angular resolution of 2.5 arcseconds at full size. The LMC is about 14,000 light-years across. ...