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A Dust Angel Nebula
Image Credit & Copyright: Rogelio Bernal Andreo (Deep Sky Colors)
http://apod.nasa.gov/apod/ap160428.html

The combined light of stars along the Milky Way are reflected by these cosmic dust clouds that soar some 300 light-years or so above the plane of our galaxy. Dubbed the Angel Nebula, the faint apparition is part of an expansive complex of dim and relatively unexplored, diffuse molecular clouds. Commonly found at high galactic latitudes, the dusty galactic cirrus can be traced over large regions toward the North and South Galactic poles. Along with the refection of starlight, studies indicate the dust clouds produce a faint reddish luminescence, as interstellar dust grains convert invisible ultraviolet radiation to visible red light. Also capturing nearby Milky Way stars and an array of distant background galaxies, the deep, wide-field 3x5 degree image spans about 10 Full Moons across planet Earth's sky toward the constellation Ursa Major.
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Laura Tarantino's profile photolawn thu's profile photo
9 comments
 
hi
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NGC 6872: A Stretched Spiral Galaxy
Image Credit: FORS Team, 8.2-meter VLT Antu, ESO; Processing & License: Judy Schmidt
http://apod.nasa.gov/apod/ap160426.html

What makes this spiral galaxy so long? Measuring over 700,000 light years across from top to bottom, NGC 6872, also known as the Condor galaxy, is one of the most elongated barred spiral galaxies known. The galaxy's protracted shape likely results from its continuing collision with the smaller galaxy IC 4970, visible just above center. Of particular interest is NGC 6872's spiral arm on the upper left, as pictured here, which exhibits an unusually high amount of blue star forming regions. The light we see today left these colliding giants before the days of the dinosaurs, about 300 million years ago. NGC 6872 is visible with a small telescope toward the constellation of the Peacock (Pavo).
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Welfredo Muniz's profile photoLisa Runyon's profile photo
5 comments
 
That is pretty
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M16: Pillars of Star Creation
Image Credit: J. Hester, P. Scowen (ASU), HST, +NASA
http://apod.nasa.gov/apod/ap160424.html

Newborn stars are forming in the Eagle Nebula. This image, taken with the Hubble Space Telescope in 1995, shows evaporating gaseous globules (EGGs) emerging from pillars of molecular hydrogen gas and dust. The giant pillars are light years in length and are so dense that interior gas contracts gravitationally to form stars. At each pillars' end, the intense radiation of bright young stars causes low density material to boil away, leaving stellar nurseries of dense EGGs exposed. The Eagle Nebula, associated with the open star cluster M16, lies about 7000 light years away. The pillars of creation were imaged again in 2007 by the orbiting Spitzer Space Telescope in infrared light, leading to the conjecture that the pillars may already have been destroyed by a local supernova, but light from that event has yet to reach the Earth.
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Chantal M's profile photoRobert Makela's profile photo
20 comments
 
It should be called "the Weasels of Star Creation"
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NGC 7635: The Bubble Nebula
Image Credit: +NASA, +European Space Agency, ESA, Hubble Heritage Team (STScI / AURA)
http://apod.nasa.gov/apod/ap160422.html

Blown by the wind from a massive star, this interstellar apparition has a surprisingly familiar shape. Cataloged as NGC 7635, it is also known simply as The Bubble Nebula. Although it looks delicate, the 7 light-year diameter bubble offers evidence of violent processes at work. Above and left of the Bubble's center is a hot, O-type star, several hundred thousand times more luminous and around 45 times more massive than the Sun. A fierce stellar wind and intense radiation from that star has blasted out the structure of glowing gas against denser material in a surrounding molecular cloud. The intriguing Bubble Nebula and associated cloud complex lie a mere 7,100 light-years away toward the boastful constellation Cassiopeia. This sharp, tantalizing view of the cosmic bubble is a composite of Hubble Space Telescope image data from 2016, released to celebrate the 26th anniversary of Hubble's launch.
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Juda Ali's profile photoytel serolf's profile photomaria lagunas's profile photo
14 comments
 
It's beautiful ! 
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Galaxy Einstein Ring
Image Credit: Y. Hezaveh (Stanford) et al., ALMA (NRAO/ESO/NAOJ), +NASA/+European Space Agency, ESA Hubble Space Telescope
http://apod.nasa.gov/apod/ap160420.html

Can one galaxy hide behind another? Not in the case of SDP.81. Here the foreground galaxy, shown in blue in an image taken by the Hubble Space Telescope, acts like a huge gravitational lens, pulling light from a background galaxy, shown in red in an image taken in radio waves by the Atacama Large Millimeter Array (ALMA), around it, keeping it visible. The alignment is so precise that the distant galaxy is distorted into part of a ring around the foreground galaxy, a formation known as an Einstein ring. Detailed analysis of the gravitational lens distortions indicate that a small dark satellite galaxy participates in the deflections, bolstering indication that many satellite galaxies are quite dim and dominated by dark matter. That small galaxy is depicted by a small white dot on the left. Although spanning only a few arcseconds, the featured Einstein ring is really tens of thousands of light years across.
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Louie Stapleton's profile photoFabio Sau's profile photoBurak Bağdatlı's profile photoRyan Dupée's profile photo
20 comments
 
+Burak Bağdatlı

Thanks for your work. I looked them over. The first is definitely about earth's atmosphere. The second, I hope that is not the only technique that they use. Then there's problems. The third, their data couldn't help them unless they used the different channels in the 42GHz range, which still was to variable to be useful in that regard. The sun's corona is highly variable by the second and the effect it has changes drastically. I couldn't find them actually doing the calculations in the actually paper but they did admit that the data for I think it was 15 and 31 GHz was not useful.

I'll keep looking but as far as galactic, I haven't seen anything except magnetic lensing for high energy.
They all assume non-rotational magnetic fields. Would that make a difference?


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The International Space Station over Earth
Image Credit: STS-132 Crew, Expedition 23 Crew, +NASA
http://apod.nasa.gov/apod/ap160418.html

The International Space Station is the largest object ever constructed by humans in space. The station perimeter extends over roughly the area of a football field, although only a small fraction of this is composed of modules habitable by humans. The station is so large that it could not be launched all at once -- it continues to be built built piecemeal. To function, the ISS needs huge trusses, some over 15 meters long and with masses over 10,000 kilograms, to keep it rigid and to route electricity and liquid coolants. Pictured above, the immense space station was photographed from the now-retired space shuttle Atlantis after a week-long stay in 2010. Across the image top hangs part of a bright blue Earth, in stark contrast to the darkness of interstellar space across the bottom.
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Klaus Teufel's profile photoFrank nelson's profile photoAlom Khan's profile photo
9 comments
 
K ggk
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Asperatus Clouds Over New Zealand
Image Credit & Copyright: Witta Priester
http://apod.nasa.gov/apod/ap160417.html

What kind of clouds are these? Although their cause is presently unknown, such unusual atmospheric structures, as menacing as they might seem, do not appear to be harbingers of meteorological doom. Known informally as Undulatus asperatus clouds, they can be stunning in appearance, unusual in occurrence, are relatively unstudied, and have even been suggested as a new type of cloud. Whereas most low cloud decks are flat bottomed, asperatus clouds appear to have significant vertical structure underneath. Speculation therefore holds that asperatus clouds might be related to lenticular clouds that form near mountains, or mammatus clouds associated with thunderstorms, or perhaps a foehn wind -- a type of dry downward wind that flows off mountains. Such a wind called the Canterbury arch streams toward the east coast of New Zealand's South Island. The featured image, taken above Hanmer Springs in Canterbury, New Zealand, in 2005, shows great detail partly because sunlight illuminates the undulating clouds from the side.
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BIG C's profile photoKarin  Ettinger's profile photoAmber wings's profile photoAnna Seladones's profile photo
45 comments
 
Wow
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Have them in circles
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Omega Centauri: The Brightest Globular Star Cluster
Image Credit & Copyright: Roberto Colombari
http://apod.nasa.gov/apod/ap160427.html

This huge ball of stars predates our Sun. Long before humankind evolved, before dinosaurs roamed, and even before our Earth existed, ancient globs of stars condensed and orbited a young Milky Way Galaxy. Of the 200 or so globular clusters that survive today, Omega Centauri is the largest, containing over ten million stars. Omega Centauri is also the brightest globular cluster, at apparent visual magnitude 3.9 it is visible to southern observers with the unaided eye. Cataloged as NGC 5139, Omega Centauri is about 18,000 light-years away and 150 light-years in diameter. Unlike many other globular clusters, the stars in Omega Centauri show several different ages and trace chemical abundances, indicating that the globular star cluster has a complex history over its 12 billion year age.
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Michael McMurray's profile photo
9 comments
 
Could you expand a little more on the history, I'm very interested the nature of globular.
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Supernova Remnant Simeis 147: The Spaghetti Nebula
Image Credit & Copyright: Giuseppe Donatiello (Italy) and Tim Stone (USA)
http://apod.nasa.gov/apod/ap160425.html

It's easy to get lost following the intricate strands of the Spaghetti Nebula. A supernova remnant cataloged as Simeis 147 and Sh2-240, the glowing gas filaments cover nearly 3 degrees -- 6 full moons -- on the sky. That's about 150 light-years at the stellar debris cloud's estimated distance of 3,000 light-years. This sharp composite includes image data taken through a narrow-band filter to highlight emission from hydrogen atoms tracing the shocked, glowing gas. The supernova remnant has an estimated age of about 40,000 years, meaning light from the massive stellar explosion first reached Earth about 40,000 years ago. But the expanding remnant is not the only aftermath. The cosmic catastrophe also left behind a spinning neutron star or pulsar, all that remains of the original star's core.
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lynn bracken's profile photo
8 comments
 
Amazingly Great
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Milky Way in Moonlight
Image Credit & Copyright: Babak Tafreshi (TWAN)
http://apod.nasa.gov/apod/ap160423.html

A waning crescent moon, early morning twilight, and Al Hamra's city lights on the horizon can't hide the central Milky Way in this skyscape from planet Earth. Captured in a single exposure, the dreamlike scene looks southward across the region's grand canyon from Jabal Shams (Sun Mountain), near the highest peak in Oman, on the Arabian Peninsula. Mist, moonlight, and shadows still play along the steep canyon walls. Dark rifts along the luminous band of the Milky Way are the galaxy's cosmic dust clouds. Typically hundreds of light-years distant, they obscure starlight along the galactic plane, viewed edge-on from the Solar System's perspective.
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Jennifer Syms's profile photoJulie Nino's profile photo
14 comments
 
+Jose Bacio​ babe lets find a place with this view 
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The Comet, the Owl, and the Galaxy
Image Credit & Copyright: Bob Franke
http://apod.nasa.gov/apod/ap160421.html

Comet C/2014 S2 (PanSTARRS) poses for a Messier moment in this telescopic snapshot from April 18. In fact it shares the 1.5 degree wide field-of-view with two well-known entries in the 18th century comet-hunting astronomer's famous catalog. Outward bound and sweeping through northern skies just below the Big Dipper, the fading visitor to the inner Solar System was about 18 light-minutes from our fair planet. Dusty, edge-on spiral galaxy Messier 108 (upper right) is more like 45 million light-years away. A planetary nebula with an aging but intensely hot central star, the owlish Messier 97 is only about 12 thousand light-years distant though, still well within our own Milky Way galaxy. Astronomers expect the orbit of this comet PanSTARRS to return it to the inner Solar System around the year 4226.
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Timothy Broman's profile photopinnku singh's profile photoShannon McGuinness's profile photo
4 comments
 
Untouched by man!
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Andromeda Rising over Colombia
Image Credit & Copyright: Hugo Armando Rua Gutierrez
http://apod.nasa.gov/apod/ap160419.html

What’s that rising over the hill? A galaxy. Never having seen a galaxy themselves, three friends of an industrious astrophotographer experienced an exhilarating night sky firsthand that featured not only the band of our Milky Way galaxy but also Milky Way's neighbor -- the Andromeda galaxy. Capturing the scene required careful pre-shot planning including finding a good site, waiting for good weather, balancing relative angular sizes with a zoom lens, managing ground lighting, and minimizing atmospheric light absorption. The calculated shot therefore placed the friends on a hill about 250 meters away and about 50 meters up. The featured single-exposure image was taken last July 26 at about 11:30 pm in Guatape, Colombia, about two hours from Medellin. The surrounding stars visible are all nearby in our own galaxy, while the small galaxy just above M31 is Andromeda's satellite M110.
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Gina Fuentes's profile photoTrini Rican's profile photoGloria Terrell's profile photoSteven Meyers's profile photo
12 comments
 
Lets see, Elysha, Moses, and um, whose that third guy?
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Astronomy Picture of the Day (APoD)'s Collections
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Discover the cosmos!
Introduction
Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.