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<rss version="2.0" xmlns:opensearch="http://a9.com/-/spec/opensearch/1.1/" xmlns:media="http://search.yahoo.com/mrss/"><channel><title>Astronomical Objects: Zazzle.com Gallery: Products </title><link>http://feed.zazzle.com/z.2/api/find.aspx?ft=rss&amp;ch=fmayhar&amp;ou=/fmayhar/rss</link><description></description><language>en-us</language><pubDate>Tue, 24 Nov 2009 11:55:06 GMT</pubDate><ttl>60</ttl><opensearch:totalResults>87</opensearch:totalResults><opensearch:startIndex>1</opensearch:startIndex><opensearch:itemsPerPage>15</opensearch:itemsPerPage><opensearch:Query role="request" searchTerms="" />
<item><guid isPermaLink="false">http://www.zazzle.com/butterfly_emerges_from_stellar_demise_in_planetary_poster-228831353198579216?gl=fmayhar</guid><pubDate>Thu, 10 Sep 2009 03:34:39 GMT</pubDate><title><![CDATA[Butterfly Emerges from Stellar Demise in Planetary]]></title><link>http://www.zazzle.com/butterfly_emerges_from_stellar_demise_in_planetary_poster-228831353198579216?gl=fmayhar</link><author>fmayhar</author><description><![CDATA[
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</div>]]></description><media:title><![CDATA[Butterfly Emerges from Stellar Demise in Planetary]]></media:title><media:description><![CDATA[This celestial object looks like a delicate butterfly. But it is far from serene.

What resemble dainty butterfly wings are actually roiling cauldrons of gas heated to more than 36,000 degrees Fahrenheit. The gas is tearing across space at more than 600,000 miles an hour—fast enough to travel from Earth to the Moon in 24 minutes!

A dying star that was once about five times the mass of the Sun is at the center of this fury. It has ejected its envelope of gases and is now unleashing a stream of ultraviolet radiation that is making the cast-off material glow. This object is an example of a planetary nebula, so-named because many of them have a round appearance resembling that of a planet when viewed through a small telescope.

The Wide Field Camera 3 (WFC3), a new camera aboard NASA's Hubble Space Telescope, snapped this image of the planetary nebula, catalogued as NGC 6302, but more popularly called the Bug Nebula or the Butterfly Nebula. WFC3 was installed by NASA astronauts in May 2009, during the servicing mission to upgrade and repair the 19-year-old Hubble telescope.

NGC 6302 lies within our Milky Way galaxy, roughly 3,800 light-years away in the constellation Scorpius. The glowing gas is the star's outer layers, expelled over about 2,200 years. The &quot;butterfly&quot; stretches for more than two light-years, which is about half the distance from the Sun to the nearest star, Alpha Centauri.

The central star itself cannot be seen, because it is hidden within a doughnut-shaped ring of dust, which appears as a dark band pinching the nebula in the center. The thick dust belt constricts the star's outflow, creating the classic &quot;bipolar&quot; or hourglass shape displayed by some planetary nebulae.

The star's surface temperature is estimated to be about 400,000 degrees Fahrenheit, making it one of the hottest known stars in our galaxy. Spectroscopic observations made with ground-based telescopes show that the gas is roughly 36,000 degrees Fahrenheit, which is unusually hot compared to a typical planetary nebula.

The WFC3 image reveals a complex history of ejections from the star. The star first evolved into a huge red-giant star, with a diameter of about 1,000 times that of our Sun. It then lost its extended outer layers. Some of this gas was cast off from its equator at a relatively slow speed, perhaps as low as 20,000 miles an hour, creating the doughnut-shaped ring. Other gas was ejected perpendicular to the ring at higher speeds, producing the elongated &quot;wings&quot; of the butterfly-shaped structure. Later, as the central star heated up, a much faster stellar wind, a stream of charged particles traveling at more than 2 million miles an hour, plowed through the existing wing-shaped structure, further modifying its shape.

The image also shows numerous finger-like projections pointing back to the star, which may mark denser blobs in the outflow that have resisted the pressure from the stellar wind.

The nebula's reddish outer edges are largely due to light emitted by nitrogen, which marks the coolest gas visible in the picture. WFC3 is equipped with a wide variety of filters that isolate light emitted by various chemical elements, allowing astronomers to infer properties of the nebular gas, such as its temperature, density, and composition.

The white-colored regions are areas where light is emitted by sulfur. These are regions where fast-moving gas overtakes and collides with slow-moving gas that left the star at an earlier time, producing shock waves in the gas (the bright white edges on the sides facing the central star). The white blob with the crisp edge at upper right is an example of one of those shock waves.

NGC 6302 was imaged on July 27, 2009, with Hubble's Wide Field Camera 3 in ultraviolet and visible light. Filters that isolate emissions from oxygen, helium, hydrogen, nitrogen, and sulfur from the planetary nebula were used to create this composite image.

These Hubble observations of the planetary nebula NGC 6302 are part of the Hubble Servicing Mission 4 Early Release Observations.]]></media:description><media:thumbnail url="http://rlv.zcache.com/butterfly_emerges_from_stellar_demise_in_planetary_poster-p228831353198579216tdad_125.jpg" /><media:content url="http://rlv.zcache.com/butterfly_emerges_from_stellar_demise_in_planetary_poster-p228831353198579216tdad_500.jpg" /><media:keywords>ngc 6302, hubble space telescope, planetary nebula</media:keywords><media:rating scheme="urn:mpaa">g</media:rating></item>
<item><guid isPermaLink="false">http://www.zazzle.com/galactic_wreckage_in_stephans_quintet_poster-228423883378417718?gl=fmayhar</guid><pubDate>Thu, 10 Sep 2009 03:31:42 GMT</pubDate><title><![CDATA[Galactic Wreckage in Stephan's Quintet]]></title><link>http://www.zazzle.com/galactic_wreckage_in_stephans_quintet_poster-228423883378417718?gl=fmayhar</link><author>fmayhar</author><description><![CDATA[
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</div>]]></description><media:title><![CDATA[Galactic Wreckage in Stephan's Quintet]]></media:title><media:description><![CDATA[A clash among members of a famous galaxy quintet reveals an assortment of stars across a wide color range, from young, blue stars to aging, red stars.

This portrait of Stephan's Quintet, also known as Hickson Compact Group 92, was taken by the new Wide Field Camera 3 (WFC3) aboard NASA's Hubble Space Telescope. Stephan's Quintet, as the name implies, is a group of five galaxies. The name, however, is a bit of a misnomer. Studies have shown that group member NGC 7320, at upper left, is actually a foreground galaxy about seven times closer to Earth than the rest of the group.

Three of the galaxies have distorted shapes, elongated spiral arms, and long, gaseous tidal tails containing myriad star clusters, proof of their close encounters. These interactions have sparked a frenzy of star birth in the central pair of galaxies. This drama is being played out against a rich backdrop of faraway galaxies.

The image, taken in visible and near-infrared light, showcases WFC3's broad wavelength range.

The colors trace the ages of the stellar populations, showing that star birth occurred at different epochs, stretching over hundreds of millions of years. The camera's infrared vision also peers through curtains of dust to see groupings of stars that cannot be seen in visible light.

NGC 7319, at top right, is a barred spiral with distinct spiral arms that follow nearly 180 degrees back to the bar. The blue specks in the spiral arm at the top of NGC 7319 and the red dots just above and to the right of the core are clusters of many thousands of stars. Most of the quintet is too far away even for Hubble to resolve individual stars.

Continuing clockwise, the next galaxy appears to have two cores, but it is actually two galaxies, NGC 7318A and NGC 7318B. Encircling the galaxies are young, bright blue star clusters and pinkish clouds of glowing hydrogen where infant stars are being born. These stars are less than 10 million years old and have not yet blown away their natal cloud. Far away from the galaxies, at right, is a patch of intergalactic space where many star clusters are forming.

NGC 7317, at bottom left, is a normal-looking elliptical galaxy that is less affected by the interactions.

Sharply contrasting with these galaxies is the dwarf galaxy NGC 7320 at upper left. Bursts of star formation are occurring in the galaxy's disk, as seen by the blue and pink dots. In this galaxy, Hubble can resolve individual stars, evidence that NGC 7320 is closer to Earth.

NGC 7320 is 40 million light-years from Earth. The other members of the quintet reside 290 million light-years away in the constellation Pegasus.

These farther members are markedly redder than the foreground galaxy, suggesting that older stars reside in their cores. The stars' light also may be further reddened by dust stirred up in the encounters.

Spied by Edouard M. Stephan in 1877, Stephan's Quintet is the first compact group ever discovered.

WFC3 observed the quintet in July and August 2009. The composite image was made by using filters that isolate light from the blue, green, and infrared portions of the spectrum, as well as emission from ionized hydrogen.

These Hubble observations are part of the Hubble Servicing Mission 4 Early Release Observations. NASA astronauts installed the WFC3 camera during a servicing mission in May to upgrade and repair the 19-year-old Hubble telescope.]]></media:description><media:thumbnail url="http://rlv.zcache.com/galactic_wreckage_in_stephans_quintet_poster-p228423883378417718tdad_125.jpg" /><media:content url="http://rlv.zcache.com/galactic_wreckage_in_stephans_quintet_poster-p228423883378417718tdad_500.jpg" /><media:keywords>hubble space telescope, stephan's quintet, galaxy</media:keywords><media:rating scheme="urn:mpaa">g</media:rating></item>
<item><guid isPermaLink="false">http://www.zazzle.com/a_glimpse_of_the_milky_way_tie-151455748898757725?gl=fmayhar</guid><pubDate>Sun, 21 Dec 2008 19:35:10 GMT</pubDate><title><![CDATA[A GLIMPSE of the Milky Way tie]]></title><link>http://www.zazzle.com/a_glimpse_of_the_milky_way_tie-151455748898757725?gl=fmayhar</link><author>fmayhar</author><description><![CDATA[
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</div>]]></description><media:title><![CDATA[A GLIMPSE of the Milky Way tie]]></media:title><media:description><![CDATA[In visible light, the bulk of our Milky Way galaxy's stars are eclipsed behind thick clouds of galactic dust and gas. But to the infrared eyes of NASA's Spitzer Space Telescope, distant stars and dust clouds shine with unparalleled clarity and color. In this panoramic image (center row) from the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) project, a plethora of stellar activity in the Milky Way's galactic plane, reaching to the far side of our galaxy, is exposed. This image spans 9 degrees of sky (approximately the width of a fist held out at arm's length). The red clouds indicate the presence of large organic molecules (mixed with the dust), which have been illuminated by nearby star formation. The patches of black are dense obscuring dust clouds impenetrable by even Spitzer's super-sensitive infrared eyes. Bright arcs of white throughout the image are massive stellar incubators. With over 160 megapixels, the full detail in this panorama cannot be appreciated without zooming in to various areas of interest (top and bottom rows). Bubbles, or holes, in the red clouds are formed by the powerful outflows from massive groups of forming stars. Wisps of green indicate the presence of hot hydrogen gas. Star clusters can also be seen as the groupings of blue, yellow, and green specks inside some of the red nebulae, or star-forming clouds. In contrast to the plentiful examples of stellar youth in this montage, Spitzer also sees an object called a planetary nebula (top row, middle). Such nebulae are the final gasp of dying stars like our sun, whose outer layers are blown into space, leaving a burnt -out core of a star, called a white dwarf, behind. Although this panoramic image captures a large range of the galaxy, it represents only 7.5 percent of the primary GLIMPSE survey, which will image most of the star formation regions in our galaxy. The infrared images were captured with the Spitzer's Infrared Array Camera (IRAC). The pictures are 4-channel false-color composites, showing emission from wavelengths of 3.6 microns (blue), 4.5 microns (green), 5.8 microns (orange), and 8.0 microns (red).]]></media:description><media:thumbnail url="http://rlv.zcache.com/a_glimpse_of_the_milky_way_tie-p151455748898757725td9w_125.jpg" /><media:content url="http://rlv.zcache.com/a_glimpse_of_the_milky_way_tie-p151455748898757725td9w_500.jpg" /><media:keywords>astronomy, spitzer space telescope, infrared, milky way</media:keywords><media:rating scheme="urn:mpaa">g</media:rating></item>
<item><guid isPermaLink="false">http://www.zazzle.com/tie_galaxies-151785467365279580?gl=fmayhar</guid><pubDate>Tue, 16 Dec 2008 07:10:17 GMT</pubDate><title><![CDATA[Tie Galaxies]]></title><link>http://www.zazzle.com/tie_galaxies-151785467365279580?gl=fmayhar</link><author>fmayhar</author><description><![CDATA[
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<item><guid isPermaLink="false">http://www.zazzle.com/eagle_nebula_skateboard-186921233944093030?gl=fmayhar</guid><pubDate>Tue, 02 Sep 2008 15:38:44 GMT</pubDate><title><![CDATA[Eagle nebula skateboard]]></title><link>http://www.zazzle.com/eagle_nebula_skateboard-186921233944093030?gl=fmayhar</link><author>fmayhar</author><description><![CDATA[
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<item><guid isPermaLink="false">http://www.zazzle.com/saturn_from_cassini_skateboard-186000074507204983?gl=fmayhar</guid><pubDate>Tue, 02 Sep 2008 15:34:38 GMT</pubDate><title><![CDATA[Saturn from Cassini]]></title><link>http://www.zazzle.com/saturn_from_cassini_skateboard-186000074507204983?gl=fmayhar</link><author>fmayhar</author><description><![CDATA[
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<item><guid isPermaLink="false">http://www.zazzle.com/spiral_galaxy_m74_poster-228419116823716111?gl=fmayhar</guid><pubDate>Fri, 30 Nov 2007 18:40:53 GMT</pubDate><title><![CDATA[Spiral Galaxy M74]]></title><link>http://www.zazzle.com/spiral_galaxy_m74_poster-228419116823716111?gl=fmayhar</link><author>fmayhar</author><description><![CDATA[
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</div>]]></description><media:title><![CDATA[Spiral Galaxy M74]]></media:title><media:description><![CDATA[Resembling festive lights on a holiday wreath, this NASA/ESA Hubble Space Telescope image of the nearby spiral galaxy M74 is an iconic reminder of the impending season. Bright knots of glowing gas light up the spiral arms, indicating a rich environment of star formation.

Messier 74, also called NGC 628, is a stunning example of a &quot;grand-design&quot; spiral galaxy that is viewed by Earth observers nearly face-on. Its perfectly symmetrical spiral arms emanate from the central nucleus and are dotted with clusters of young blue stars and glowing pink regions of ionized hydrogen (hydrogen atoms that have lost their electrons). These regions of star formation show an excess of light at ultraviolet wavelengths. Tracing along the spiral arms are winding dust lanes that also begin very near the galaxy's nucleus and follow along the length of the spiral arms.

M74 is located roughly 32 million light-years away in the direction of the constellation Pisces, the Fish. It is the dominant member of a small group of about half a dozen galaxies, the M74 galaxy group. In its entirety, it is estimated that M74 is home to about 100 billion stars, making it slightly smaller than our Milky Way.

The spiral galaxy was first discovered by the French astronomer Pierre M&#233;chain in 1780. Weeks later it was added to Charles Messier's famous catalog of deep-sky objects.

This Hubble image of M74 is a composite of Advanced Camera for Surveys data taken in 2003 and 2005. The filters used to create the color image isolate light from blue, visible, and infrared portions of the spectrum, as well as emission from ionized hydrogen (known as HII regions).

A small segment of this image used data from the Canada-France-Hawaii Telescope and the Gemini Observatory to fill in a region that Hubble did not image.]]></media:description><media:thumbnail url="http://rlv.zcache.com/spiral_galaxy_m74_poster-p228419116823716111tdar_125.jpg" /><media:content url="http://rlv.zcache.com/spiral_galaxy_m74_poster-p228419116823716111tdar_500.jpg" /><media:keywords>astronomy, hubble space telescope, spiral, galaxy, m74</media:keywords><media:rating scheme="urn:mpaa">g</media:rating></item>
<item><guid isPermaLink="false">http://www.zazzle.com/young_cluster_ngc3603_poster-228237624186048652?gl=fmayhar</guid><pubDate>Sat, 06 Oct 2007 17:12:00 GMT</pubDate><title><![CDATA[Young Cluster NGC3603]]></title><link>http://www.zazzle.com/young_cluster_ngc3603_poster-228237624186048652?gl=fmayhar</link><author>fmayhar</author><description><![CDATA[
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</div>]]></description><media:title><![CDATA[Young Cluster NGC3603]]></media:title><media:description><![CDATA[Thousands of sparkling young stars are nestled within the giant nebula NGC 3603. This stellar &quot;jewel box&quot; is one of the most massive young star clusters in the Milky Way Galaxy. NGC 3603 is a prominent star-forming region in the Carina spiral arm of the Milky Way, about 20,000 light-years away. This latest image from NASA's Hubble Space Telescope shows a young star cluster surrounded by a vast region of dust and gas. The image reveals stages in the life cycle of stars.]]></media:description><media:thumbnail url="http://rlv.zcache.com/young_cluster_ngc3603_poster-p228237624186048652tdar_125.jpg" /><media:content url="http://rlv.zcache.com/young_cluster_ngc3603_poster-p228237624186048652tdar_500.jpg" /><media:keywords>astronomy, hubble space telescope, open, cluster, ngc, 3603</media:keywords><media:rating scheme="urn:mpaa">g</media:rating></item>
<item><guid isPermaLink="false">http://www.zazzle.com/infrared_helix_nebula_poster-228249935649628477?gl=fmayhar</guid><pubDate>Sat, 25 Aug 2007 05:28:08 GMT</pubDate><title><![CDATA[Infrared Helix Nebula]]></title><link>http://www.zazzle.com/infrared_helix_nebula_poster-228249935649628477?gl=fmayhar</link><author>fmayhar</author><description><![CDATA[
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</div>]]></description><media:title><![CDATA[Infrared Helix Nebula]]></media:title><media:description><![CDATA[The Helix Nebula, which is composed of gaseous shells and disks puffed out by a dying sunlike star, exhibits complex structure on the smallest visible scales. In this new image from NASA's Spitzer Space Telescope, infrared light at wavelengths of 3.2, 4.5, and 8.0 microns has been colored blue, green, and red (respectively). The &quot;cometary knots&quot; show blue-green heads due to excitation of their molecular material from shocks or ultraviolet radiation. The tails of the cometary knots appear redder due to being shielded from the central star's ultraviolet radiation and wind by the heads of the knots.]]></media:description><media:thumbnail url="http://rlv.zcache.com/infrared_helix_nebula_poster-p228249935649628477tdar_125.jpg" /><media:content url="http://rlv.zcache.com/infrared_helix_nebula_poster-p228249935649628477tdar_500.jpg" /><media:keywords>astronomy, spitzer space telescope, helix nebula, ngc 7293, ngc7293</media:keywords><media:rating scheme="urn:mpaa">g</media:rating></item>
<item><guid isPermaLink="false">http://www.zazzle.com/barnard_30_poster-228314300989916963?gl=fmayhar</guid><pubDate>Wed, 18 Jul 2007 04:47:58 GMT</pubDate><title><![CDATA[Barnard 30]]></title><link>http://www.zazzle.com/barnard_30_poster-228314300989916963?gl=fmayhar</link><author>fmayhar</author><description><![CDATA[
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This image from NASA's Spitzer Space Telescope shows infant stars &quot;hatching&quot; in the head of the hunter constellation, Orion. Astronomers suspect that shockwaves from a supernova explosion in Orion's head, nearly three million years ago, may have initiated this newfound birth.

The region featured in this Spitzer image is called Barnard 30. It is located approximately 1,300 light-years away and sits on the right side of Orion's head, just north of the massive star Lambda Orionis.

Wisps of red in the cloud are organic molecules called polycyclic aromatic hydrocarbons (PAHs). PAHs are formed anytime carbon-based materials are burned incompletely. On Earth, they can be found in the sooty exhaust from automobile and airplane engines. They also coat the grills where charcoal-broiled meats are cooked.

This image shows infrared light captured by Spitzer's infrared array camera. Light with wavelengths of 8 and 5.8 microns (red and orange) comes mainly from dust that has been heated by starlight. Light of 4.5 microns (green) shows hot gas and dust; and light of 3.6 microns (blue) is from starlight.]]></media:description><media:thumbnail url="http://rlv.zcache.com/barnard_30_poster-p228314300989916963tdar_125.jpg" /><media:content url="http://rlv.zcache.com/barnard_30_poster-p228314300989916963tdar_500.jpg" /><media:keywords>astronomy, spitzer, space telescope, barnard, 30, star-forming, region, nebula</media:keywords><media:rating scheme="urn:mpaa">g</media:rating></item>
<item><guid isPermaLink="false">http://www.zazzle.com/multiwavelength_m81_poster-228603274804219284?gl=fmayhar</guid><pubDate>Wed, 18 Jul 2007 04:42:54 GMT</pubDate><title><![CDATA[Multiwavelength M81]]></title><link>http://www.zazzle.com/multiwavelength_m81_poster-228603274804219284?gl=fmayhar</link><author>fmayhar</author><description><![CDATA[
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M81 may be undergoing a surge of star formation along the spiral arms due to a close encounter it may have had with its nearby spiral galaxy NGC 3077 and a nearby starburst galaxy (M82) about 300 million years ago.

M81 is one of the brightest galaxies that can be seen from the Earth. It is high in the northern sky in the circumpolar constellation Ursa Major, the Great Bear. At an apparent magnitude of 6.8 it is just at the limit of naked-eye visibility. The galaxy's angular size is about the same as that of the Full Moon.

This image combines data from the Hubble Space Telescope, the Spitzer Space Telescope, and the Galaxy Evolution Explorer (GALEX) missions. The GALEX ultraviolet data were from the far-UV portion of the spectrum (135 to 175 nanometers). The Spitzer infrared data were taken with the IRAC 4 detector (8 microns). The Hubble data were taken at the blue portion of the spectrum.a]]></media:description><media:thumbnail url="http://rlv.zcache.com/multiwavelength_m81_poster-p228603274804219284tdar_125.jpg" /><media:content url="http://rlv.zcache.com/multiwavelength_m81_poster-p228603274804219284tdar_500.jpg" /><media:keywords>astronomy, spitzer, space telescope, ngc, 3031, bode's, galaxy, m81, spiral</media:keywords><media:rating scheme="urn:mpaa">g</media:rating></item>
<item><guid isPermaLink="false">http://www.zazzle.com/dwarf_galaxy_ngc_4449_poster-228552752494045583?gl=fmayhar</guid><pubDate>Wed, 18 Jul 2007 04:33:16 GMT</pubDate><title><![CDATA[Dwarf Galaxy NGC 4449]]></title><link>http://www.zazzle.com/dwarf_galaxy_ngc_4449_poster-228552752494045583?gl=fmayhar</link><author>fmayhar</author><description><![CDATA[
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But nearly 12.5 million light-years away in the dwarf galaxy NGC 4449 stellar &quot;fireworks&quot; are going off all the time.

Hundreds of thousands of vibrant blue and red stars blaze in this image taken by NASA's Hubble Space Telescope. Hot bluish-white clusters of massive stars are scattered throughout the galaxy, interspersed with numerous dustier, reddish regions of current star formation. Massive dark clouds of gas and dust are silhouetted against the starlight.

NGC 4449 has been forming stars for several billion years, but currently it is experiencing a star formation event at a much higher rate than in the past. This unusually explosive and intense star formation activity qualifies as a starburst. At the current rate, the gas supply that feeds the stellar production would only last for another billion years or so.

Starbursts usually occur in the central regions of galaxies, but NGC 4449 has more widespread star formation activity, since the very youngest stars are observed both in the nucleus and in streams surrounding the galaxy.

A &quot;global&quot; starburst like NGC 4449 resembles primordial star forming galaxies, which grew by merging with and accreting smaller stellar systems. Since NGC 4449 is close enough to be observed in great detail, it is the ideal laboratory for the investigation of what may have occurred during galactic formation and evolution in the early universe.

It's likely that the current widespread starburst was triggered by interaction or merging with a smaller companion. NGC 4449 belongs to a group of galaxies in the constellation Canes Venatici. Astronomers think that NGC 4449's star formation has been influenced by interactions with several of its neighbors.

This image was taken in November 2005 by an international science team led by Alessandra Aloisi of the Space Telescope Science Institute (STScI) in Baltimore and the European Space Agency (ESA). Other team members include Francesca Annibali (STScI), Claus Leitherer (STScI), Jennifer Mack (STScI), Marco Sirianni (STScI/ESA), Monica Tosi (INAF-OAB), and Roeland van der Marel (STScI).

Hubble's Advanced Camera for Surveys observed the NGC 4449 in blue, visible, infrared, and H-alpha light.]]></media:description><media:thumbnail url="http://rlv.zcache.com/dwarf_galaxy_ngc_4449_poster-p228552752494045583tdar_125.jpg" /><media:content url="http://rlv.zcache.com/dwarf_galaxy_ngc_4449_poster-p228552752494045583tdar_500.jpg" /><media:keywords>astronomy, hubble space telescope, ngc4449, dwarf, galaxy</media:keywords><media:rating scheme="urn:mpaa">g</media:rating></item>
<item><guid isPermaLink="false">http://www.zazzle.com/spiral_galaxy_m81_poster-228640656691277110?gl=fmayhar</guid><pubDate>Wed, 18 Jul 2007 04:20:18 GMT</pubDate><title><![CDATA[Spiral Galaxy M81]]></title><link>http://www.zazzle.com/spiral_galaxy_m81_poster-228640656691277110?gl=fmayhar</link><author>fmayhar</author><description><![CDATA[
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This beautiful galaxy is tilted at an oblique angle on to our line of sight, giving a &quot;birds-eye view&quot; of the spiral structure. The galaxy is similar to our Milky Way, but our favorable view provides a better picture of the typical architecture of spiral galaxies. Though the galaxy is 11.6 million light-years away, NASA Hubble Space Telescope's view is so sharp that it can resolve individual stars, along with open star clusters, globular star clusters, and even glowing regions of fluorescent gas.

The spiral arms, which wind all the way down into the nucleus, are made up of young, bluish, hot stars formed in the past few million years. They also host a population of stars formed in an episode of star formation that started about 600 million years ago. The greenish regions are dense areas of bright star formation. The ultraviolet light from hot young stars are fluorescing the surrounding clouds of hydrogen gas. A number of sinuous dust lanes also wind all the way into the nucleus of M81.

The galaxy's central bulge contains much older, redder stars. It is significantly larger than the Milky Way's bulge. A black hole of 70 million solar masses resides at the center of M81. The black hole is about 15 times the mass of the Milky Way's black hole. Previous Hubble research shows that the size of the central black hole in a galaxy is proportional to the mass of a galaxy's bulge.

M81 may be undergoing a surge of star formation along the spiral arms due to a close encounter it may have had with its nearby spiral galaxy NGC 3077 and a nearby starburst galaxy (M82) about 300 million years ago. Astronomers plan to use the Hubble image to study the star formation history of the galaxy and how this history relates to the neutron stars and black holes seen in X-ray observations of M81 with NASA's Chandra X-ray Observatory.

M81 is one of the brightest galaxies that can be seen from the Earth. It is high in the northern sky in the circumpolar constellation Ursa Major, the Great Bear. At an apparent magnitude of 6.8 it is just at the limit of naked-eye visibility. The galaxy's angular size is about the same as that of the Full Moon.

The Hubble data was taken with the Advanced Camera for Surveys in 2004 through 2006. This color composite was assembled from images taken in blue, visible, and infrared light.]]></media:description><media:thumbnail url="http://rlv.zcache.com/spiral_galaxy_m81_poster-p228640656691277110tdar_125.jpg" /><media:content url="http://rlv.zcache.com/spiral_galaxy_m81_poster-p228640656691277110tdar_500.jpg" /><media:keywords>astronomy, hubble space telescope, m81, spiral, galaxy</media:keywords><media:rating scheme="urn:mpaa">g</media:rating></item>
<item><guid isPermaLink="false">http://www.zazzle.com/pleiades_t_shirt-235623160214384674?gl=fmayhar</guid><pubDate>Sat, 23 Jun 2007 17:43:08 GMT</pubDate><title><![CDATA[Pleiades T-Shirt]]></title><link>http://www.zazzle.com/pleiades_t_shirt-235623160214384674?gl=fmayhar</link><author>fmayhar</author><description><![CDATA[
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<item><guid isPermaLink="false">http://www.zazzle.com/seven_sisters_t_shirt-235454768375781751?gl=fmayhar</guid><pubDate>Thu, 21 Jun 2007 04:15:31 GMT</pubDate><title><![CDATA[Seven Sisters T-Shirt]]></title><link>http://www.zazzle.com/seven_sisters_t_shirt-235454768375781751?gl=fmayhar</link><author>fmayhar</author><description><![CDATA[
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