Agregador de notícies

Solstice to Solstice Solargraph

Astronomy Picture of the Day - Dv, 26/06/2009 - 19:10
DIV ALIGN=CENTERa href="http://antwrp.gsfc.nasa.gov/apod/image/0906/solsolargraph_zapior.jpg" IMG SRC="http://antwrp.gsfc.nasa.gov/apod/image/0906/solsolargraph_zapior850.jpg" alt="See Explanation. Clicking on the picture will download the highest resolution version available."/a /DIV DIV STYLE="max-width:40em"P P b Solstice to Solstice Solargraph /b br b Credit a href="http://antwrp.gsfc.nasa.gov/apod/lib/about_apod.html#srapply"Copyright/a: /b a href="http://www.asu.cas.cz/~sos/staff/maciek/zapior.htm"Maciej Zapioacute;r/a P p b Explanation: /b This six month long exposure compresses the a href="http://www.moma.org/collection/ browse_results.php?object_id=79018"time/a from solstice to solstice (~ December 21, 2008 to June 20, 2009) into a single point of view. Dubbed a solargraph, the a href="http://www.asu.cas.cz/~sos/staff/maciek/puszki.htm"unconventional picture/a was recorded with a pinhole camera a href="http://www.pinholephotography.org/ Solargraph%20instructions.htm"made from/a an aluminum can lined with a piece of photographic paper. Fixed to a a href="http://www.solargraphy.com/index.php? option=com_contenttask=viewid=16Itemid=18"single spot/a for the entire exposure, the simple camera continuously records the Sun's daily path as a glowing trail burned into the photosensitive paper. Breaks and gaps in the trails are caused by cloud cover. In this case, the spot was chosen to look out from inside a a href="http://www.asu.cas.cz/_data/k40l_1232294978.jpg"radio telescope/a at the a href="http://www.asu.cas.cz/history"Ondrejov Observatory/a in the Czech Republic. At the end of the exposure, the paper was removed from the can and immediately scanned digitally. Contrasts and colors were then enhanced and added to the digital image. Of course, in December, the Sun trails a href="http://antwrp.gsfc.nasa.gov/apod/ap071222.html"begin lower/a down at the northern hemisphere's winter solstice. The trails a href="http://antwrp.gsfc.nasa.gov/apod/ap081221.html"climb higher/a in the sky as the June 21st summer solstice approaches. p P script type="text/javascript" digg_url = 'http://apod.nasa.gov/apod/ap090626.html'; digg_skin = 'compact'; /script script src="http://digg.com/tools/diggthis.js" type="text/javascript"/script /DIV

Sarychev Peak Volcano in Stereo

Astronomy Picture of the Day - Dj, 25/06/2009 - 17:10
DIV ALIGN=CENTERa href="http://antwrp.gsfc.nasa.gov/apod/image/0906/ISS020-E-9050_52ana_public.jpg" IMG SRC="http://antwrp.gsfc.nasa.gov/apod/image/0906/ISS020-E-9050_52ana_public800.jpg" alt="See Explanation. Clicking on the picture will download the highest resolution version available."/a /DIV DIV STYLE="max-width:40em"P P b Sarychev Peak Volcano in Stereo /b br b Credit: /b a href="http://www.nasa.gov/mission_pages/station/expeditions/ expedition20/index.html"Expedition 20 Crew/a - International Space Station, a href="http://www.nasa.gov/"NASA/a br bStereo Image: /b a href="http://www.tridi.be/"Patrick Vantuyne/a P p b Explanation: /b From 400 kilometers a href="http://spaceflight.nasa.gov/realdata/tracking/index.html"above planet Earth/a, the Expedition 20 Crew onboard the International Space Station (a href="http://antwrp.gsfc.nasa.gov/apod/ap090406.html"ISS/a) was able to witness a remarkable event from a remarkable vantage point -- the June 12 eruption of the a href="http://www.volcano.si.edu/world/ volcano.cfm?vnum=0900-24="Sarychev Peak Volcano/a. The active volcano is located in Russia's a href="http://en.wikipedia.org/wiki/Kuril_Islands"Kuril Island chain/a, stretching to the northeast of Japan. Emphasizing the orbital perspective, this stunning color a href="http://www.tridi.be/"stereo view/a was made by combining two a href="http://earthobservatory.nasa.gov/NaturalHazards/ view.php?id=38985"images from the ISS/a and is intended to be viewed with a href="http://mpfwww.jpl.nasa.gov/MPF/mpf/glasses.html"red/blue glasses/a (red for the left eye). Punching upwards into the atmosphere at an early stage of the eruption, the volcanic plume features a brown column of ash topped with a smooth, bubble-like, white cloud that is likely water condensation. Below, a cloud of denser grey ash slides down the volcanic slope. About 1.5 kilometers of the island coastline is visible at ground level. The evolving a href="http://earthobservatory.nasa.gov/NaturalHazards/ event.php?id=38937"ash plume/a posed no danger to the Expedition 20 crew, but commercial airline flights were diverted away from the region to minimize the danger of engine failures from ash intake. p P script type="text/javascript" digg_url = 'http://apod.nasa.gov/apod/ap090625.html'; digg_skin = 'compact'; /script script src="http://digg.com/tools/diggthis.js" type="text/javascript"/script /DIV

Noctilucent Clouds Over Germany

Astronomy Picture of the Day - Dj, 25/06/2009 - 04:10
DIV ALIGN=CENTERa href="http://antwrp.gsfc.nasa.gov/apod/image/0906/noctilucent_rollwagen.jpg" IMG SRC="http://antwrp.gsfc.nasa.gov/apod/image/0906/noctilucent_rollwagen.jpg" alt="See Explanation. Clicking on the picture will download the highest resolution version available."/a /DIV DIV STYLE="max-width:40em"P P b Noctilucent Clouds Over Germany /b br b Credit Copyright: /b a href="mailto: c.rollwagen at artics.de"Christoph Rollwagen/a P p b Explanation: /b Sometimes it's night on the ground but day in the air. As the Earth rotates to eclipse the Sun, a href="http://antwrp.gsfc.nasa.gov/apod/ap070713.html"sunset/a rises up from the ground. Therefore, at sunset on the ground, sunlight still shines on a href="http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cld/home.rxml" clouds/a above. Under usual circumstances, a a href="http://antwrp.gsfc.nasa.gov/apod/ap980526.html"pretty sunset/a might be visible, but unusual a href="http://en.wikipedia.org/wiki/Noctilucent_clouds" noctilucent clouds/a float so high up they can be seen well after dark. Pictured above last week, a network of a href="http://www.youtube.com/watch?v=pslcQXWQz3k"noctilucent clouds/a cast an eerie white glow after dusk, beyond a local field near a href="http://en.wikipedia.org/wiki/Potsdam"Potsdam/a, a href="http://en.wikipedia.org/wiki/Germany"Germany/a. Although a href="http://www.spaceweather.com/nlcs/gallery2009_page1.htm" noctilucent clouds/a are thought to be composed of small ice-coated particles, a href="http://www.nlcnet.co.uk/" much remains unknown/a about them. Satellites launched to help study these clouds include Sweden's a href="http://en.wikipedia.org/wiki/Odin_%28satellite%29"Odin/a and NASA's a href="http://en.wikipedia.org/wiki/Aeronomy_of_Ice_in_the_Mesosphere" AIM/a. a href="http://www.nrl.navy.mil/pressRelease.php?Y=2003R=35-03r" Recent evidence/a indicates that at least some a href="http://www.youtube.com/watch?v=-xF2vSKINK0" noctilucent clouds/a result from freezing water exhaust from a href="http://antwrp.gsfc.nasa.gov/apod/ap021023.html"Space Shuttle/as. p P script type="text/javascript" digg_url = 'http://apod.nasa.gov/apod/ap090624.html'; digg_skin = 'compact'; /script script src="http://digg.com/tools/diggthis.js" type="text/javascript"/script /DIV

Molecular Cloud Barnard 68

Astronomy Picture of the Day - Dm, 23/06/2009 - 13:10
DIV ALIGN=CENTERa href="http://antwrp.gsfc.nasa.gov/apod/image/0906/barnard68v2_vlt_big.jpg" IMG SRC="http://antwrp.gsfc.nasa.gov/apod/image/0906/barnard68v2_vlt.jpg" alt="See Explanation. Clicking on the picture will download the highest resolution version available."/a /DIV DIV STYLE="max-width:40em"P P b Molecular Cloud Barnard 68 /b br b Credit: /b a href="http://www.eso.org/instruments/fors1/"FORS Team/a, a href="http://www.eso.org/projects/vlt/"8.2-meter VLT Antu/a, a href="http://www.eso.org/"ESO/a P p b Explanation: /b Where did all the stars go? What used to be considered a hole in the sky is now known to astronomers as a dark a href= "http://en.wikipedia.org/wiki/Molecular_cloud" molecular cloud/a. Here, a high concentration of a href="http://antwrp.gsfc.nasa.gov/apod/ap030706.html"dust/a and a href="http://antwrp.gsfc.nasa.gov/apod/ap970430.html"molecular gas/a absorb practically all the visible light emitted from background stars. The eerily dark surroundings help make the interiors of a href="http://www.youtube.com/watch?v=YbdwTwB8jtc" molecular clouds/a some of the coldest and most isolated places in the universe. One of the most notable of these a href="http://antwrp.gsfc.nasa.gov/apod/dark_nebulae.html"dark absorption nebulae/a is a cloud toward the constellation a href="http://www.seds.org/Maps/Stars_en/Fig/ophiuchus.html" Ophiuchus/a known as a href="http://en.wikipedia.org/wiki/Barnard_68"Barnard 68/a, a href="http://www.eso.org/gallery/v/ESOPIA/Stars/phot-02a-01.tif.html" pictured above/a. That no stars are visible in the center indicates that a href="http://en.wikipedia.org/wiki/Edward_Emerson_Barnard"Barnard/a 68 is relatively nearby, with measurements placing it about 500 light-years away and half a a href="http://starchild.gsfc.nasa.gov/docs/StarChild/questions/question19.html" light-year/a across. It is not known exactly how a href="http://archive.ncsa.uiuc.edu/Cyberia/Bima/GMC.html" molecular clouds/a like a href="http://curious.astro.cornell.edu/question.php?number=597" Barnard 68/a form, but it is known that these clouds are themselves a href="http://antwrp.gsfc.nasa.gov/apod/ap070218.html"likely places/a for a href="http://zebu.uoregon.edu/~js/ast122/lectures/lec14.html" new stars to form/a. In fact, a href="http://adsabs.harvard.edu/abs/2009ApJ...695.1308B" Barnard 68/a itself has a href="http://www.universetoday.com/2009/06/09/astronomers-predict-birth-of-a-new-star/"recently been found/a likely to collapse and form a new star system. It is possible to a href="http://www.eso.org/outreach/press-rel/pr-1999/phot-29-99.html" look right through/a the cloud in a href="http://coolcosmos.ipac.caltech.edu/cosmic_classroom/ir_tutorial/discovery.html" infrared/a light. p P script type="text/javascript" digg_url = 'http://apod.nasa.gov/apod/ap090623.html'; digg_skin = 'compact'; /script script src="http://digg.com/tools/diggthis.js" type="text/javascript"/script /DIV

Atlas 5 Rocket Launches to the Moon

Astronomy Picture of the Day - Dm, 23/06/2009 - 00:10
DIV ALIGN=CENTERa href="http://antwrp.gsfc.nasa.gov/apod/image/0906/lrolaunch_nasa_big.jpg" IMG SRC="http://antwrp.gsfc.nasa.gov/apod/image/0906/lrolaunch_nasa.jpg" alt="See Explanation. Clicking on the picture will download the highest resolution version available."/a /DIV DIV STYLE="max-width:40em"P P b Atlas 5 Rocket Launches to the Moon /b br b Credit: /b a href="http://www.nasa.gov/"NASA/a P p b Explanation: /b This rocket is headed for the Moon. a href="http://www.nasa.gov/images/content/361142main_atlasliftoff3000.jpg" Pictured above/a, a huge a href="http://en.wikipedia.org/wiki/Atlas_V"Altas V/a rocket a href="http://www.youtube.com/watch?v=j-5t4de6jjI"roared off the launch pad/a last week to start NASA's a href="http://www.filmsite.org/voya.html"first missions to Earth's/a a href="http://www.youtube.com/watch?v=xbGd_240ynk"Moon/a in 10 years. The a href="http://antwrp.gsfc.nasa.gov/apod/ap020916.html"rocket/a is carrying two robotic spacecraft. The a href="http://lro.gsfc.nasa.gov/"Lunar Reconnaissance Orbiter/a (a href="http://en.wikipedia.org/wiki/Lunar_Reconnaissance_Orbiter"LRO/a) is scheduled to orbit and better map the Moon, search for buried and hidden ice, and return many high resolution images. Some images will be below one-meter in resolution and include images of historic a href="http://antwrp.gsfc.nasa.gov/apod/ap070720.html"Apollo landing site/as. Exploratory data and images should allow a more informed choice of possible future astronaut landing sites. The a href="http://lcross.arc.nasa.gov/"Lunar CRater Observation and Sensing Satellite/a (LCROSS) is scheduled to a href="http://twitter.com/LCROSS_NASA"monitor/a the controlled a href="http://antwrp.gsfc.nasa.gov/apod/ap050705.html"impact/a of the rocket's upper stage into a permanently shadowed crater near the a href="http://antwrp.gsfc.nasa.gov/apod/ap980306.html"Moon's south pole/a. This impact, which should occur in about three months, might be visible on Earth through a href="http://antwrp.gsfc.nasa.gov/apod/ap050413.html"small telescopes/a. p P script type="text/javascript" digg_url = 'http://apod.nasa.gov/apod/ap090622.html'; digg_skin = 'compact'; /script script src="http://digg.com/tools/diggthis.js" type="text/javascript"/script /DIV

Sunrise over the Parthenon

Astronomy Picture of the Day - Dg, 21/06/2009 - 09:10
DIV ALIGN=CENTERa href="http://antwrp.gsfc.nasa.gov/apod/image/0906/parthenon_ayiomamitis_big.jpg" IMG SRC="http://antwrp.gsfc.nasa.gov/apod/image/0906/parthenon_ayiomamitis.jpg" alt="See Explanation. Clicking on the picture will download the highest resolution version available."/a /DIV DIV STYLE="max-width:40em"P P b Sunrise over the Parthenon /b br b Credit a href="http://antwrp.gsfc.nasa.gov/apod/lib/about_apod.html#srapply"Copyright/a: /b a href="http://www.perseus.gr/"Anthony Ayiomamitis/a (a href="http://www.twanight.org/"TWAN/a) P p b Explanation: /b Today, the sun will stay in the sky longer than any other day of the year, as seen from the northern hemisphere of Earth. Named the Summer Solstice, today's a href="http://antwrp.gsfc.nasa.gov/apod/ap080922.html"maximum daylight/a is indicative of the high amount of sunlight this time of year that is primarily responsible for the heat of the a href="http://en.wikipedia.org/wiki/Summer"summer season/a. At the a href="http://antwrp.gsfc.nasa.gov/apod/ap040919.html"north pole/a and for all places above the a href="http://en.wikipedia.org/wiki/Arctic_Circle"arctic circle/a, there will be no night -- the entire day today will be lit by sunlight. The situation is reversed in Earth's southern hemisphere, where today has the least sunlight of any day. Today's a href="http://en.wikipedia.org/wiki/Solstice" solstice/a is commemorated above by a a href="http://www.perseus.gr/Astro-Solar-Scenes-Parthenon-04.htm" well-planned picture/a of our five billion year old Sun rising behind the 2,500 year old a href="http://en.wikipedia.org/wiki/Parthenon"Parthenon/a in a href="http://en.wikipedia.org/wiki/Greece"Greece/a. Trees and birds occupy the foreground, while a modern a href="http://cic.nist.gov/vrml/equip.html"crane/a is shown restoring parts of this historic symbol of a cultural a href="http://www.historyworld.net/wrldhis/PlainTextHistories.asp?historyid=ab25" civilization/a. p P script type="text/javascript" digg_url = 'http://apod.nasa.gov/apod/ap090621.html'; digg_skin = 'compact'; /script script src="http://digg.com/tools/diggthis.js" type="text/javascript"/script /DIV

Seaside Moon Mirage

Astronomy Picture of the Day - Ds, 20/06/2009 - 20:10
DIV ALIGN=CENTERa href="http://antwrp.gsfc.nasa.gov/apod/image/0906/Navires013_audrin.jpg" IMG SRC="http://antwrp.gsfc.nasa.gov/apod/image/0906/Navires013_audrin900.jpg" alt="See Explanation. Clicking on the picture will download the highest resolution version available."/a /DIV DIV STYLE="max-width:40em"P P b Seaside Moon Mirage /b br b Credit a href="http://antwrp.gsfc.nasa.gov/apod/lib/about_apod.html#srapply"Copyright/a: /b a href="mailto: audrin at sympatico dot ca"Jean-Marc Audrin/a P p b Explanation: /b This surprising view of the Full Moon a href="http://stardate.org/nightsky/moon/"rising on/a June 7 was captured with a telephoto lens from a seaside balcony near Nice, France. The a href="http://antwrp.gsfc.nasa.gov/apod/ap050922.html"orange Moon's/a dark markings and odd shape put the photographer in mind of an alien creature's face staring down at the passing ship. Of course, the Moon's distorted appearance is due to the unusual bending (a href="http://interactagram.com/physics/optics/ refraction/"refraction/a) of light rays creating multiple images or a href="http://en.wikipedia.org/wiki/ Mirage_of_astronomical_objects"mirages/a, similar to a href="http://www.atoptics.co.uk/atoptics/sunmir.htm"sunset and sunrise mirages/a. The effects are most pronounced when a href="http://www.atoptics.co.uk/atoptics/mirtemp.htm"temperature layers/a in the atmosphere produce sharp changes in air density and refractive index. Acting over long sight-lines to the rising and setting Sun or Moon, the refraction significantly alters the a href="http://www.atoptics.co.uk/atoptics/gfmmform.htm"path of light rays/a creating merged, distorted images. Such mirages are also associated with the a href="http://antwrp.gsfc.nasa.gov/apod/ap040321.html"Green Flash/a. p P script type="text/javascript" digg_url = 'http://apod.nasa.gov/apod/ap090620.html'; digg_skin = 'compact'; /script script src="http://digg.com/tools/diggthis.js" type="text/javascript"/script /DIV

Dunhuang Star Atlas

Astronomy Picture of the Day - Dv, 19/06/2009 - 18:10
DIV ALIGN=CENTERa href="http://antwrp.gsfc.nasa.gov/apod/image/0906/dunhuang_npole_copie.jpg" IMG SRC="http://antwrp.gsfc.nasa.gov/apod/image/0906/dunhuang_npole_c800.jpg" alt="See Explanation. Clicking on the picture will download the highest resolution version available."/a /DIV DIV STYLE="max-width:40em"P P b Dunhuang Star Atlas /b br b Credit and Copyright: /b a href="http://arxiv.org/abs/0906.3034"J.-M. Bonnet-Bidaud/a (a href="http://www.cea.fr/le_cea/les_centres_cea/saclay"CEA, Saclay/a), F. Praderie (Obs. Paris) S. Whitfield (British Library) P p b Explanation: /b This ancient Chinese map of planet Earth's northern sky is part of the Dunhuang Star Atlas, one of the most impressive documents in the a href="http://en.wikipedia.org/wiki/ Timeline_of_Chinese_astronomy"history of astronomy/a. The oldest complete star atlas known, it dates to the years 649 to 684, discovered at the a href="http://antwrp.gsfc.nasa.gov/apod/ap080831.html"Silk Road/a town of Dunhuang in 1907. a href="http://arxiv.org/abs/0906.3034"A recent analysis/a that examines the accuracy and projections used to make it notes the atlas marks positions of over 1,300 stars and outlines 257 Chinese a href="http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/ e_research_chinengstarzone.htm"star groups or asterisms/a. The star positions in the hand drawn atlas were found to be accurate to within a few degrees. In this example showing the north polar region, a very recognizable a href="http://antwrp.gsfc.nasa.gov/apod/ap070108.html"Big Dipper/a, part of the modern constellation Ursa Major, lies along the bottom of the chart. An additional 12 charts depict equatorial regions in 30 degree sections and also include a grouping resembling the modern constellation a href="http://antwrp.gsfc.nasa.gov/apod/ap030207.html"Orion/a. The a href="http://www.nature.com/nature/journal/v459/n7248/full/ 459778a.html"atlas is on display/a at the British Library in London to celebrate the a href="http://www.iya2009.org/"International Year of Astronomy/a. p P script type="text/javascript" digg_url = 'http://apod.nasa.gov/apod/ap090619.html'; digg_skin = 'compact'; /script script src="http://digg.com/tools/diggthis.js" type="text/javascript"/script /DIV

NGC 6240: Merging Galaxies

Astronomy Picture of the Day - Dj, 18/06/2009 - 16:10
DIV ALIGN=CENTERa href="http://antwrp.gsfc.nasa.gov/apod/image/0906/ngc6240_spitzerhubble.jpg" IMG SRC="http://antwrp.gsfc.nasa.gov/apod/image/0906/ngc6240_spitzerhubble_c800.jpg" alt="See Explanation. Clicking on the picture will download the highest resolution version available."/a /DIV DIV STYLE="max-width:40em"P P b NGC 6240: Merging Galaxies /b br b Credit: /b a href="http://www.nasa.gov/"NASA/a / a href="http://spitzer.caltech.edu/"JPL-Caltech/a / a href="http://www.spacetelescope.org/"STScI-ESA/a / a href="http://arxiv.org/abs/0807.4549"S. Bush, et al./a (a href="http://www.cfa.harvard.edu/"Harvard-Smithsonian CfA/a) P p b Explanation: /b NGC 6240 offers a rare glimpse of a cosmic catastrophe in its final throes. The titanic galaxy-galaxy a href="http://burro.case.edu/JavaLab/GalCrashWeb/main.html"collision/a is located a mere 400 million light-years away in the constellation a href="http://www.hawastsoc.org/deepsky/oph/index.html"Ophiuchus/a. One of the brightest sources in the a href="http://coolcosmos.ipac.caltech.edu/cosmic_classroom/ ir_tutorial/index.html"infrared sky/a, the merging galaxies spew distorted a href="http://antwrp.gsfc.nasa.gov/apod/ap060108.html"tidal tails/a of stars, gas, and dust and undergo frantic bursts of star formation. The a href="http://antwrp.gsfc.nasa.gov/apod/ap021128.html"two supermassive/a black holes in the original galactic cores will also coalesce into a single, even more massive black hole. a href="http://hubblesite.org/newscenter/archive/releases/2008/16/ image/ae/"Soon, only/a one large galaxy will remain. a href="http://www.spitzer.caltech.edu/Media/releases/ssc2009-06/ release.shtml"This dramatic image/a of the scene is a multiwavelength composite; red colors trace infrared emission from dust recorded by the a href="http://www.spitzer.caltech.edu/Media/releases/ssc2009-12/ release.shtml"Spitzer Space Telescope/a, with Hubble visible light images of stars and gas in green and blue hues. The view spans over 300,000 light-years at the estimated distance a href="http://arxiv.org/abs/0807.4549"of NGC 6240/a. p P script type="text/javascript" digg_url = 'http://apod.nasa.gov/apod/ap090618.html'; digg_skin = 'compact'; /script script src="http://digg.com/tools/diggthis.js" type="text/javascript"/script /DIV

M13: A Great Globular Cluster of Stars

Astronomy Picture of the Day - Dj, 18/06/2009 - 03:10
DIV ALIGN=CENTERa href="http://antwrp.gsfc.nasa.gov/apod/image/0906/m13_russell_big.jpg" IMG SRC="http://antwrp.gsfc.nasa.gov/apod/image/0906/m13_russell.jpg" alt="See Explanation. Clicking on the picture will download the highest resolution version available."/a /DIV DIV STYLE="max-width:40em"P P b M13: A Great Globular Cluster of Stars /b br b Credit Copyright: /b a href="mailto: stargazzzer at prodigy dot net"Danny Lee Russell/a P p b Explanation: /b a href="http://www.seds.org/messier/m/m013.html"M13/a is one of the most prominent and best known a href="http://antwrp.gsfc.nasa.gov/apod/globular_clusters.html"globular clusters/a. Visible with binoculars in the constellation of a href= "http://en.wikipedia.org/wiki/Hercules_(constellation)" Hercules/a, M13 is frequently one of the first objects found by a href="http://antwrp.gsfc.nasa.gov/apod/ap040808.html"curious sky gazers/a seeking a href="http://www.astropics.co.uk/m13.htm" celestials wonders/a a href="http://en.wikipedia.org/wiki/Man_Plus"beyond normal human/a vision. a href="http://www.concentric.net/~Richmann/m13w.htm" M13/a is a colossal home to over 100,000 stars, spans over 150 a href="http://www.howstuffworks.com/question94.htm" light years/a across, lies over 20,000 light years distant, and is over 12 billion years old. At the 1974 dedication of a href="http://www.naic.edu/"Arecibo Observatory/a, a a href="http://antwrp.gsfc.nasa.gov/apod/ap000123.html"radio message/a about Earth was sent in the direction of a href="http://www.windows.umich.edu/cgi-bin/tour_def/the_universe/Globulars.html"M13/a. The reason for the low abundance of unusual a href="http://antwrp.gsfc.nasa.gov/apod/ap971104.html"blue straggler stars/a in M13 a href="http://adsabs.harvard.edu/abs/1997ApJ...484L.145F" remains unknown/a. p P script type="text/javascript" digg_url = 'http://apod.nasa.gov/apod/ap090617.html'; digg_skin = 'compact'; /script script src="http://digg.com/tools/diggthis.js" type="text/javascript"/script /DIV

Moonrise Over Turkey

Astronomy Picture of the Day - Dm, 16/06/2009 - 12:10
DIV ALIGN=CENTERa href="http://antwrp.gsfc.nasa.gov/apod/image/0906/moonrise_sisman_orig.jpg" onMouseOver="if (document.images) document.imagename1.src='image/0906/moonrise_sisman_hb14.jpg';" onMouseOut="if (document.images) document.imagename1.src='image/0906/moonrise_sisman.jpg';" IMG SRC="http://antwrp.gsfc.nasa.gov/apod/image/0906/moonrise_sisman.jpg" name=imagename1 alt="See Explanation. Moving the cursor over the image will bring up an annotated version. Clicking on the image will bring up the highest resolution version available."/a /DIV DIV STYLE="max-width:40em"P P b Moonrise Over Turkey /b br b Credit Copyright: /b a href="mailto: murat at pantarim-europe.com"Tahir Sisman/a P p b Explanation: /b Is the Moon larger when near the horizon? No -- as shown above, the a href="http://en.wikipedia.org/wiki/Moon"Moon/a appears to be very nearly the same size no matter its location on the sky. Oddly, the cause or causes for the common a href="http://en.wikipedia.org/wiki/Moon_illusion" Moon Illusion/a are still being debated. Two leading explanations both hinge on the a href="http://www.badastronomy.com/bad/misc/moonbig.html" illusion/a that foreground objects make a a href="http://antwrp.gsfc.nasa.gov/apod/ap010219.html"horizon Moon/a seem farther in the distance. The historically a href="http://unmuseum.mus.pa.us/exmoon.htm" most popular explanation/a then holds that the mind interprets more distant objects as wider, while a a href="http://facstaff.uww.edu/mccreadd/" more recent explanation/a adds that the distance illusion may actually make the a href="http://www.youtube.com/watch?v=AsKeu4wm3XI" eye focus/a differently. Either way, the a href="http://antwrp.gsfc.nasa.gov/apod/ap071025.html"angular diameter of the Moon/a is always about 0.5 degrees. In the above time-lapse sequence of the a href="http://antwrp.gsfc.nasa.gov/apod/ap031011.html"Moon/a taken in 2007, with one exposure taken to bring up the foreground of a href="http://en.wikipedia.org/wiki/Izmit"Izmit/a Bay in a href="http://en.wikipedia.org/wiki/Turkey"Turkey/a. On the occasion of our 14th a href= "http://antwrp.gsfc.nasa.gov/apod/archivepix.html"anniversary/a, the a href="http://antwrp.gsfc.nasa.gov/apod/image/0906/astronomybeat_apod.pdf"APOD editors/a thank all of our contributors and a href="http://antwrp.gsfc.nasa.gov/apod/lib/about_apod.html" mirror site operators/a whose volunteer efforts help bring the wonders of a href="http://www.astronomy2009.org/"astronomy/a to millions of people around the world. Additional thanks also go to our a href="http://www.bulutsu.org/ggg/"Turkish mirror site/a operators for submitting the above mouseover image. p P script type="text/javascript" digg_url = 'http://apod.nasa.gov/apod/ap090616.html'; digg_skin = 'compact'; /script script src="http://digg.com/tools/diggthis.js" type="text/javascript"/script /DIV

Streaming Dark Nebulas near B44

Astronomy Picture of the Day - Dll, 15/06/2009 - 23:10
DIV ALIGN=CENTERa href="http://antwrp.gsfc.nasa.gov/apod/image/0906/b44_davis_big.jpg" IMG SRC="http://antwrp.gsfc.nasa.gov/apod/image/0906/b44_davis.jpg" alt="See Explanation. Clicking on the picture will download the highest resolution version available."/a /DIV DIV STYLE="max-width:40em"P P b Streaming Dark Nebulas near B44 /b br b Credit a href="http://www.tvdavisastropics.com/astroimages-1_000023.htm" Copyright/a: /b a href="http://www.tvdavisastropics.com/astroimages-1_000015.htm" Thomas V. Davis/a (a href="http://tvdavisastropics.com/"tvdavisastropix.com/a) P p b Explanation: /b Dark dust lit by the bright yellow star Antares highlight this photogenic starscape of the southern sky. A a href="http://antwrp.gsfc.nasa.gov/apod/ap070911.html"wider angle image/a shows the a href="http://antwrp.gsfc.nasa.gov/apod/ap070930.html"central band/a of our a href="http://en.wikipedia.org/wiki/Milky_Way_galaxy"Milky Way Galaxy/a connected to a href="http://en.wikipedia.org/wiki/Antares"Antares/a by streams of dust knows as the a href="http://antwrp.gsfc.nasa.gov/apod/ap080603.html"Dark River/a. At the a href="http://antwrp.gsfc.nasa.gov/apod/ap070903.html"head of the Dark River/a the a href="http://nedwww.ipac.caltech.edu/level5/Mathis/Mathis1.html" dust/a appears in dense knots. One of the densest knots is a href="http://cosmonut.org/Rho%20Ophiuchus.htm" B44/a, pictured near the bottom of the above image. Off to the left of the a href="http://www.tvdavisastropics.com/astroimages-1_00007f.htm"above image/a lies Antares, a star so bright that the a href="http://server1.sky-map.org/starview?object_type=3object_id=236" pictured dust/a reflects its light, giving it a distinct yellow hue. a href="http://www.youtube.com/watch?v=SQtcjz7Q9Cg"Light/a from the blue star on the image left creates a surrounding blue a href="http://antwrp.gsfc.nasa.gov/apod/reflection_nebulae.html"reflection nebula/a named a href="http://www.capella-observatory.com/ImageHTMLs/DiffuseNebula/IC4605.htm"IC 4605/a. B44 and IC 4605 lies about 500 a href= "http://starchild.gsfc.nasa.gov/docs/StarChild/questions/question19.html" light years/a distant toward the a href="http://en.wikipedia.org/wiki/Constellation"constellation/a of the a href="http://en.wikipedia.org/wiki/Scorpion"Scorpion/a. p P script type="text/javascript" digg_url = 'http://apod.nasa.gov/apod/ap090615.html'; digg_skin = 'compact'; /script script src="http://digg.com/tools/diggthis.js" type="text/javascript"/script /DIV

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