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Astronomy Picture of the Day (APoD)
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Orion Over and Under Tibet
Image Credit & Copyright: Jeff Dai

This night was so serene you could see Orion rise downwards. The unusual spectacle was captured in this single-exposure image, featuring a deep sky around the famous constellation of Orion that appeared both above -- and reflected in -- a peaceful lake in the Gyirong Valley of Tibet, China. Taken last year at this time, the three belt stars of Orion can be seen lined up almost vertically above and below the Himalayan Mountains. The complex Orion Nebula can be seen to the belt stars' right, while the red-glowing circular structure surrounding Orion is Barnard's Loop. Also, the bright red star Betelgeuse is doubly visible on the image left, while bright blue Rigel appears twice on the image right. Familiar Orion is becoming increasingly visible as Winter (Summer) descends on the Northern (Southern) hemisphere.
Daniel B's profile photoSophia the Sophisticated's profile photoJames Nakason Huang's profile photoSawsen Hamdi's profile photo
This photo is so beautiful! 
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Charon: Moon of Pluto
Image Credit: +NASA, Johns Hopkins Univ./APL, Southwest Research Institute

A darkened and mysterious north polar region informally known as Mordor Macula caps this premier high-resolution portrait of Charon, Pluto's largest moon. Captured by New Horizons near its closest approach on July 14, the image data was transmitted to Earth on September 21. The combined blue, red, and infrared data is processed to enhance colors, following variations in surface properties with a resolution of about 2.9 kilometers (1.8 miles). In fact, Charon is 1,214 kilometers (754 miles) across, about 1/10th the size of planet Earth but a whopping 1/2 the diameter of Pluto itself. That makes it the largest satellite relative to its planet in the solar system. This remarkable image of Charon's Pluto-facing hemisphere shows a clearer view of an apparently moon-girdling belt of fractures and canyons that seems to separate smooth southern plains from varied northern terrain.
Miller Tight's profile photoAnnika PATTERSON-RIVERA's profile photoJagruti Babariya's profile photoClementina Duran's profile photo
Thanks nice picture
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Seasonal Streaks Point to Recent Flowing Water on Mars
Image Credit: +NASA, +NASA Jet Propulsion Laboratory, U. Arizona

What creates these changing streaks on Mars? Called Recurring Slope Linea (RSL), these dark features start on the slopes of hills and craters but don't usually extend to the bottom. What's even more unusual is that these streaks appear to change with the season, appearing fresh and growing during warm weather and disappearing during the winter. After much study, including a recent chemical analyses, a leading hypothesis has emerged that these streaks are likely created by new occurrences of liquid salty water that evaporates as it flows. The source for the briny water is still unclear, with two possibilities being condensation from the Martian atmosphere and underground reservoirs. An exciting inference is that if these briny flows are not too salty, they may be able to support microbial life on Mars even today. The featured image of a hill inside Horowitz Crater was investigated by instruments aboard the robotic Mars Reconnaissance Orbiter that has been returning data from Mars since 2006.
Bruce Bonham's profile photoBob Thune's profile photoHarshvardhan s's profile photoAnnika PATTERSON-RIVERA's profile photo
If It gets too warm on the Earth, then we can establish Cities , on the Mars planet, with the water we can have oxygen and hydrogen, we just need nitrogen for plants !
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Total Lunar Eclipse over Waterton Lake
Image Credit & Copyright: Yuichi Takasaka / TWAN /

Recorded in 2014 April, this total lunar eclipse sequence looks south down icy Waterton Lake from the Waterton Lakes National Park in Alberta, Canada, planet Earth. The most distant horizon includes peaks in Glacier National Park, USA. An exposure every 10 minutes captured the Moon's position and eclipse phase, as it arced, left to right, above the rugged skyline and Waterton town lights. In fact, the sequence effectively measures the roughly 80 minute duration of the total phase of the eclipse. Around 270 BC, the Greek astronomer Aristarchus also measured the duration of lunar eclipses - though probably without the benefit of digital clocks and cameras. Still, using geometry, he devised a simple and impressively accurate way to calculate the Moon's distance, in terms of the radius of planet Earth, from the eclipse duration. This modern eclipse sequence also tracks the successive positions of Mars, above and right of the Moon, bright star Spica next to the reddened lunar disk, and Saturn to the left and below.
Elise Metzger's profile photoRyan Hughes's profile photoSydney Bittorf's profile photoJoanne Parkin's profile photo
What's with the frozen lake?
This picture cannot be from this week!
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M31 versus M33
Image Credit & Copyright: Malcolm Park (North York Astronomical Association)

Separated by about 14 degrees (28 Full Moons) in planet Earth's sky, spiral galaxies M31 at left, and M33 are both large members of the Local Group, along with our own Milky Way galaxy. This narrow- and wide-angle, multi-camera composite finds details of spiral structure in both, while the massive neighboring galaxies seem to be balanced in starry fields either side of bright Mirach, beta star in the constellation Andromeda. Mirach is just 200 light-years from the Sun. But M31, the Andromeda Galaxy, is really 2.5 million light-years distant and M33, the Triangulum Galaxy, is also about 3 million light years away. Although they look far apart, M31 and M33 are engaged in a gravitational struggle. In fact, radio astronomers have found indications of a bridge of neutral hydrogen gas that could connect the two, evidence of a closer encounter in the past. Based on measurements, gravitational simulations currently predict that the Milky Way, M31, and M33 will all undergo mutual close encounters and potentially mergers, billions of years in the future.
Fabiola Carolina Hernández Pérez's profile photoDragan Jeremic's profile photo이옥희's profile photoJoanne Parkin's profile photo
So nice
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LDN 988 and Friends
Image Credit & Copyright: Rafael Rodríguez Morales

Stars are forming in dark, dusty molecular cloud LDN 988. Seen near picture center some 2,000 light-years distant, LDN 988 and other nearby dark nebulae were cataloged by Beverly T. Lynds in 1962 using Palomar Observatory Sky Survey plates. Narrowband and near-infrared explorations of the dark nebula reveal energetic shocks and outflows light-years across associated with dozens of newborn stars. But in this sharp optical telescopic view, the irregular outlines of LDN 988 and friends look like dancing stick figures eclipsing the rich starfields of the constellation Cygnus. From dark sites the region can be identified by eye alone. It's part of the Great Rift of dark clouds along the plane of the Milky Way galaxy known as the Northern Coalsack.
Danger Mouse's profile photoJoshua Tan's profile photoGary Garza's profile photoGerardor Rincon's profile photo
+Patrick O'Shea how come you change side. Just to be on top? Isn't it selfishy thing.
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Have them in circles
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The Sombrero Galaxy in Infrared
Image Credit: R. Kennicutt (Steward Obs.) et al., SSC, +NASA Jet Propulsion Laboratory, Caltech, +NASA

This floating ring is the size of a galaxy. In fact, it is a galaxy -- or at least part of one: the photogenic Sombrero Galaxy, one of the largest galaxies in the nearby Virgo Cluster of Galaxies. The dark band of dust that obscures the mid-section of the Sombrero Galaxy in optical light actually glows brightly in infrared light. The above image, digitally sharpened, shows the infrared glow, recently recorded by the orbiting Spitzer Space Telescope, superposed in false-color on an existing image taken by NASA's Hubble Space Telescope in optical light. The Sombrero Galaxy, also known as M104, spans about 50,000 light years across and lies 28 million light years away. M104 can be seen with a small telescope in the direction of the constellation Virgo.
Antonio M's profile photoJames Horne's profile photoMichael Schuh (M.)'s profile photoYAB ELY MUR's profile photo
It looks like a sole being of immense conscience embodied in a halo of surrounding wonder.. Poetically speaking, not scientific. Sometimes beauty must be shared in its simplicity. Truly amazing! Thanks for sharing.
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A Blue Blood Moon
Image Credit & Copyright: Dominique Dierick

This sharp telescopic snapshot caught late September's Harvest Moon completely immersed in Earth's dark umbral shadow, at the beginning of a total lunar eclipse. It was the final eclipse in a tetrad, a string of four consecutive total lunar eclipses. A dark apparition of the Full Moon near perigee, this total eclipse's color was a deep blood red, the lunar surface reflecting light within Earth's shadow filtered through the lower atmosphere. Seen from a lunar perspective, the reddened light comes from all the sunsets and sunrises around the edges of a silhouetted Earth. But close to the shadow's edge, the limb of the eclipsed Moon shows a distinct blue hue. The blue eclipsed moonlight is still filtered through Earth's atmosphere though, originating as rays of sunlight pass through layers high in the upper stratosphere, colored by ozone that scatters red light and transmits blue.
David Wallace's profile photoHideaki MURAKAMI's profile photoMalissa Denham's profile photoJillian Green's profile photo
Ohhh ohhh. Red. Brutal 
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Eclipsed in Southern Skies
Image Credit & Copyright: Yuri Beletsky (Carnegie Las Campanas Observatory)

This stunning panorama in southern skies was recorded on the colorful night of September 27/28 from Carngegie Las Campanas Observatory. A diffuse glow and dark rifts of the central Milky Way hang over domes of the twin 6.5 meter Magellan telescopes. But most eye-catching is the deep red glow of the Moon. Immersed in Earth's shadow during the much anticipated perigee-total-lunar eclipse, the Moon's surface reflects the light of sunsets and sunrises scattered and refracted into the planet's cone-shaped umbra. Along with the dramatic hue of the eclipsed Moon, other colors of that night captured by the sensitive digital camera include the red and green shades of atmospheric airglow. Viewers can also spot the Andromeda Galaxy below the Moon, seen as a tiny smudge through the reddish airglow and lights along the horizon. The Magellanic Clouds, satellite galaxies of the Milky Way, join in at the far left of the full panorama frame.
crystal tran's profile photoPaty Sanchez's profile photoLeandro Vasconcelos's profile photoKeith Maxey's profile photo
So awsome i the stars the cosmos
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Supermoon Total Lunar Eclipse and Lightning Storm
Image Credit & Copyright: Jose Antonio Hervás

What's more rare than a supermoon total lunar eclipse? How about a supermoon total lunar eclipse over a lightning storm. Such an electrifying sequence was captured yesterday from Ibiza, an island in southeastern Spain. After planning the location for beauty, and the timing to capture the entire eclipse sequence, the only thing that had to cooperate for this astrophotographer to capture a memorable eclipse sequence was the weather. What looked to be a bother on the horizon, though, turned out to be a blessing. The composite picture features over 200 digitally combined images from the same location over the course of a night. The full moon is seen setting as it faded to red in Earth's shadow and then returned to normal. The fortuitous lightning is seen reflected in the Mediterranean to the right of the 400-meter tall rocky island of Es Vedra. Although the next total eclipse of a large and bright supermoon will occur in 2033, the next total eclipse of any full moon will occur in January 2018 and be best visible from eastern Asia and Australia.
James Hearn's profile photoforsaken's profile photoKeren Cuevas's profile photoVelichka Mihailova's profile photo
tthanks it is a Beatifull display, 
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Tonight: A Supermoon Lunar Eclipse
Video Credit: +NASA's GSFC, David Ladd (USRA) & Krystofer Kim (USRA)

Tonight a bright full Moon will fade to red. Tonight's moon will be particularly bright because it is reaching its fully lit phase when it is relatively close to the Earth in its elliptical orbit. In fact, by some measures of size and brightness, tonight's full Moon is designated a supermoon, although perhaps the "super" is overstated because it will be only a few percent larger and brighter than the average full Moon. However, our Moon will fade to a dim red because it will also undergo a total lunar eclipse -- an episode when the Moon becomes completely engulfed in Earth's shadow. The faint red color results from blue sunlight being more strongly scattered away by the Earth's atmosphere. Tonight's moon can also be called a Harvest Moon as it is the full Moon that occurs closest to the September equinox, a time signaling crop harvest in Earth's northern hemisphere. Total eclipses of supermoons are relatively rare -- the last supermoon lunar eclipse was in 1982, and the next will be in 2033. Tonight's supermoon total eclipse will last over an hour and be best visible from eastern North America after sunset, South America in the middle of the night, and Western Europe before sunrise.
2015 September 27
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Pluto's Snakeskin Terrain
Image Credit: +NASA, Johns Hopkins Univ./APL, Southwest Research Institute

A mountainous region informally known as Tartarus Dorsa sprawls some 530 kilometers (330 miles) across this Plutonian landscape. Recently downloaded from New Horizons, it combines blue, red, and infrared image data in an extended color view captured near the spacecraft's close approach to Pluto on July 14. Shadows near the terminator, the line between Pluto's dim day and night, emphasize a rough, scaly texture. The stunning image resolves details on the distant world about 1.3 kilometers (0.8 miles) across. Refering to a part of Hades in ancient Greek mythology, Tartarus Dorsa borders Tombaugh Regio to the east.
Annika PATTERSON-RIVERA's profile photoJames Hearn's profile photoBenjamin Hawley's profile photoGerardor Rincon's profile photo
+Raymond Hawn Sir, what is a "vacuam" and what is "watet"? I don't understand what "We have not yet none any sample" means.Are ye drunk?
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Discover the cosmos!
Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.