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Εργαλεία Θεμάτων Τρόποι εμφάνισης
  #1801  
Παλιά 15-09-11, 08:18
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Τελευταία φορά Online: 12-11-16 11:12
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Astronomy Picture of the Day

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.
2011 September 15

NGC 3521: Galaxy in a Bubble
Image Credit & Copyright: R Jay Gabany (Blackbird Obs.), Collaboration: David Martinez-Delgado (MPIA, IAC), et al.
Explanation: Gorgeous spiral galaxy NGC 3521 is a mere 35 million light-years away, toward the constellation Leo. Relatively bright in planet Earth's sky, NGC 3521 is easily visible in small telescopes but often overlooked by amateur imagers in favor of other Leo spiral galaxies, like M66 and M65. Its hard to overlook in this colorful cosmic portrait, though. Spanning some 50,000 light-years the galaxy sports characteristic patchy, irregular spiral arms laced with dust, pink star forming regions, and clusters of young, blue stars. Remarkably, this deep image also finds NGC 3521 embedded in gigantic bubble-like shells. The shells are likely tidal debris, streams of stars torn from satellite galaxies that have undergone mergers with NGC 3521 in the distant past.

Tomorrow's picture: skyview

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  #1802  
Παλιά 15-09-11, 23:16
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Τελευταία φορά Online: 21-12-13 06:10
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  #1803  
Παλιά 16-09-11, 09:18
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Τελευταία φορά Online: 12-11-16 11:12
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Astronomy Picture of the Day

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.
2011 September 16

September's Harvest Moon
Image Credit & Copyright: Stefano De Rosa
Explanation: A Full Moon rising can be a dramatic celestial sight, and Full Moons can have many names. For example, Monday's Full Moon was the one nearest this year's autumnal equinox for the northern hemisphere, traditionally called the Harvest Moon. According to lore the name is a fitting one because farmers could work late into the night at the end of the growing season harvesting crops by moonlight. This serene telephoto image captures this September's harvest moonrise from Turin, Italy. In silhouette against an orange lunar disk is Turin's hilltop Basilica of Superga.

Tomorrow's picture: light-weekend

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  #1804  
Παλιά 17-09-11, 08:42
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Τελευταία φορά Online: 12-11-16 11:12
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Astronomy Picture of the Day

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.
2011 September 17

Spitzer's Orion
NASA, JPL-Caltech, T. Megeath (Univ. Toledo, Ohio)
Explanation: Few cosmic vistas excite the imagination like the Orion Nebula, an immense stellar nursery some 1,500 light-years away. This stunning false-color view spans about 40 light-years across the region, constructed using infrared data from the Spitzer Space Telescope. Compared to its visual wavelength appearance, the brightest portion of the nebula is likewise centered on Orion's young, massive, hot stars, known as the Trapezium Cluster. But the infrared image also detects the nebula's many protostars, still in the process of formation, seen here in red hues. In fact, red spots along the dark dusty filament to the left of the bright cluster include the protostar cataloged as HOPS 68, recently found to have crystals of the silicate mineral olivine within its protostellar envelope.

Tomorrow's picture: sharp spot

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skorpios (25-09-11)
  #1805  
Παλιά 18-09-11, 08:11
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Τελευταία φορά Online: 12-11-16 11:12
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Astronomy Picture of the Day

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.
2011 September 18

A Sharp View of the Sun
Credit: SST, Royal Swedish Academy of Sciences
Explanation: Here is one of the sharper views of the Sun ever taken. This stunning image shows remarkable details of a dark sunspot across the image bottom and numerous boiling granules which appear like kernels of corn across the top. Taken in 2002, the picture was made using the Swedish Solar Telescope operating on the Canary Island of La Palma. The high resolution image was achieved using sophisticated adaptive optics, digital image stacking, and other processing techniques to counter the blurring effect of Earth's atmosphere. Currently a sunspot group is crossing the Sun that is so large it can be easily seen by the cautious observer even without magnification.

Tomorrow's picture: south vesta

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skorpios (25-09-11)
  #1806  
Παλιά 19-09-11, 07:29
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Τελευταία φορά Online: 12-11-16 11:12
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Astronomy Picture of the Day

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.
2011 September 19

The South Pole of Asteroid Vesta
Image Credit: NASA, JPL-Caltech, UCLA, MPS, DLR, IDA
Explanation: What created the circular structure around the south pole of asteroid Vesta? Pictured above, the bottom of the second largest object in the asteroid belt was recently imaged for the first time by the robotic Dawn satellite that arrived last month. A close inspection of the 260-meter resolution image shows not only hills and craters and cliffs and more craters, but ragged circular features that cover most of the lower right of the 500-kilometer sized object. Early speculation posits that the structure might have been created by a collision and coalescence with a smaller asteroid. Alternatively, the features might have originated in an internal process soon after the asteroid formed. New clues might come in the next few months as Dawn spirals down toward the rocky world and obtains images of increasingly high resolution.

Tomorrow's picture: double suns

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skorpios (25-09-11)
  #1807  
Παλιά 20-09-11, 09:16
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Τελευταία φορά Online: 12-11-16 11:12
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Astronomy Picture of the Day

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.
2011 September 20


Kepler-16b: A Planet with Two Suns
Illustrated Video Credit: NASA, JPL-Caltech, T. Pyle; Acknowledgement: djxatlanta
Explanation: If you stay up long enough, you can watch both suns set. Such might be a common adage from beings floating in the atmosphere of Kepler 16b, a planet recently discovered by the space-based Kepler satellite. The above animated video shows how the planetary system might look to a visiting spaceship. Although multiple star systems are quite common, this is the first known to have a planet. Because our Earth is in the orbital plane of both stars and the planet, each body is seen to eclipse the others at different times, producing noticeable drop offs in the amount of light seen. The frequent eclipses have given Kepler 16b the most accurate mass and radius determination for a planet outside our Solar System. To find a planet like Saturn in an orbit like Venus -- so close to its binary star parents -- was a surprise and will surely become a focus of research.
Tomorrow's picture: dusty sisters
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Σχόλιο : Εντυπωσιακό...
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Τελευταία επεξεργασία από το χρήστη Xenios : 20-09-11 στις 09:19
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skorpios (25-09-11)
  #1808  
Παλιά 21-09-11, 08:24
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Τελευταία φορά Online: 12-11-16 11:12
Φύλο: Άντρας
Astronomy Picture of the Day

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.
2011 September 21

Pleiades Deep Field
Image Credit & Copyright: Stanislav Volskiy
Explanation: Have you ever seen the Pleiades star cluster? Even if you have, you probably have never seen it like this: all dusty. Perhaps the most famous star cluster on the sky, the bright stars of the Pleiades can be seen without binoculars from even the depths of a light-polluted city. With a long exposure from a dark location, though, the dust cloud surrounding the Pleiades star cluster becomes very evident. The above exposure took about 30 hours and covers a sky area several times the size of the full moon. Also known as the Seven Sisters and M45, the Pleiades lies about 400 light years away toward the constellation of the Bull (Taurus). A common legend with a modern twist is that one of the brighter stars faded since the cluster was named, leaving only six stars visible to the unaided eye. The actual number of Pleiades stars visible, however, may be more or less than seven, depending on the darkness of the surrounding sky and the clarity of the observer's eyesight.

APOD Retrospective: The Pleiades Star Cluster
Tomorrow's picture: open space

Πηγή
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skorpios (25-09-11)
  #1809  
Παλιά 22-09-11, 08:17
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Τελευταία φορά Online: 12-11-16 11:12
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Astronomy Picture of the Day

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.
2011 September 22

Arp 272
Credit: Hubble Legacy Archive, ESA, NASA; Processing - Martin Pugh
Explanation: Linking spiral arms, two large colliding galaxies are featured in this remarkable cosmic portrait constructed using image data from the Hubble Legacy Archive. Recorded in astronomer Halton Arp's Atlas of Peculiar Galaxies as Arp 272, the pair is otherwise known as NGC 6050 near center, and IC 1179 at upper right. A third galaxy, likely also a member of the interacting system, can be spotted above and left of larger spiral NGC 6050. They lie some 450 million light-years away in the Hercules Galaxy Cluster. At that estimated distance, the picture spans over 150 thousand light-years. Although this scenario does look peculiar, galaxy collisions and their eventual mergers are now understood to be common, with Arp 272 representing a stage in this inevitable process. In fact, the nearby large spiral Andromeda Galaxy is known to be approaching our own galaxy and Arp 272 may offer a glimpse of the far future collision between Andromeda and the Milky Way.

Tomorrow's picture: the equal night

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skorpios (25-09-11)
  #1810  
Παλιά 23-09-11, 08:19
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Τελευταία φορά Online: 12-11-16 11:12
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Astronomy Picture of the Day

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.
2011 September 23

September's Aurora
Image Credit & Copyright: Yuichi Takasaka / TWAN / www.blue-moon.ca
Explanation: September's equinox arrives today at 0905 UT. As the Sun crosses the celestial equator heading south, spring begins in the southern hemisphere and autumn in the north. And though the seasonal connection is still puzzling, both spring and autumn bring an increase in geomagnetic storms. So as northern nights grow longer, the equinox also heralds the arrival of a good season for viewing aurora. Recorded earlier this month, these curtains of September's shimmering green light sprawl across a gorgeous night skyscape. In the foreground lies Hidden Lake Territorial Park near Yellowknife, Northwest Territories, Canada. Calm water reflects the aurora, with bright star trails peering through the mesmerizing sky glow. Of course, shining at altitudes of 100 kilometers or so, planet Earth's auroras are visible from space.

Tomorrow's picture: light-weekend

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  #1811  
Παλιά 24-09-11, 08:24
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Τελευταία φορά Online: 12-11-16 11:12
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Astronomy Picture of the Day

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.
2011 September 24

Mangaia's Milky Way
Image Credit & Copyright: Tunç Tezel (TWAN)
Explanation: From Sagittarius to Carina, the Milky Way Galaxy shines in this dark night sky above planet Earth's lush island paradise of Mangaia. Familiar to denizens of the southern hemisphere, the gorgeous skyscape includes the bulging galactic center at the upper left and bright stars Alpha and Beta Centauri just right of center. About 10 kilometers wide, volcanic Mangaia is the southern most of the Cook Islands. Geologist estimate that at 18 million years old it is the oldest island in the Pacific Ocean. Of course, the Milky Way is somewhat older, with the galaxy's oldest stars estimated to be over 13 billion years old. (Editors note: This image holds the distinction of being selected as winner in the Royal Greenwich Observatory's Astronomy Photographer of the Year competition in the Earth and Space category.)

Tomorrow's picture: Sun day

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  #1812  
Παλιά 25-09-11, 02:22
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Τελευταία φορά Online: 21-12-13 06:10
Φύλο: Άντρας
Η διαθεσή μου τώρα:
Είναι απίστευτες φωτογραφίες φίλε Xenios
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  #1813  
Παλιά 25-09-11, 08:34
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Τελευταία φορά Online: 12-11-16 11:12
Φύλο: Άντρας
Astronomy Picture of the Day

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.
2011 September 25

A Large Tsunami Shock Wave on the Sun
Image Credit: NSO/AURA/NSF and USAF Research Laboratory
Explanation: Tsunamis this large don't happen on Earth. During 2006, a large solar flare from an Earth-sized sunspot produced a tsunami-type shock wave that was spectacular even for the Sun. Pictured above, the tsunami wave was captured moving out from active region AR 10930 by the Optical Solar Patrol Network (OSPAN) telescope in New Mexico, USA. The resulting shock wave, known technically as a Moreton wave, compressed and heated up gasses including hydrogen in the photosphere of the Sun, causing a momentarily brighter glow. The above image was taken in a very specific red color emitted exclusively by hydrogen gas. The rampaging tsunami took out some active filaments on the Sun, although many re-established themselves later. The solar tsunami spread at nearly one million kilometers per hour, and circled the entire Sun in a matter of minutes.

Tomorrow's picture: evaporating mars

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Σχόλιο : Ένα συγκλονιστικό animation από τον ήλιο.
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Τελευταία επεξεργασία από το χρήστη Xenios : 25-09-11 στις 08:42
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  #1814  
Παλιά 26-09-11, 08:45
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Τελευταία φορά Online: 12-11-16 11:12
Φύλο: Άντρας
Astronomy Picture of the Day

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.
2011 September 26

Dry Ice Pits on Mars
Image Credit: HiRISE, MRO, LPL (U. Arizona), NASA
Explanation: Part of Mars is defrosting. Around the South Pole of Mars, toward the end of every Martian summer, the warm weather causes a section of the vast carbon-dioxide ice cap to evaporate. Pits begin to appear and expand where the carbon dioxide dry ice sublimates directly into gas. These ice sheet pits may appear to be lined with gold, but the precise composition of the dust that highlights the pit walls actually remains unknown. The circular depressions toward the image center measure about 60 meters across. The HiRISE camera aboard the Mars-orbiting Mars Reconnaissance Orbiter captured the above image in late July. In the next few months, as Mars continues its journey around the Sun, colder seasons will prevail, and the thin air will turn chilly enough not only to stop the defrosting but once again freeze out more layers of solid carbon dioxide.

Tomorrow's picture: orbiting earth

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  #1815  
Παλιά 26-09-11, 21:15
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Τελευταία φορά Online: 21-12-13 06:10
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