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Εργαλεία Θεμάτων Αξιολόγηση: Αξιολόγηση θέματος: 4 Ψήφοι, 5,00 κατά μέσο όρο. Τρόποι εμφάνισης
  #1  
Παλιά 06-11-07, 14:46
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Τελευταία φορά Online: 12-11-16 10:12
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Η διαστημική φωτογραφία της ημέρας

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Τελευταία επεξεργασία από το χρήστη pazo : 06-11-07 στις 20:46
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The Following 8 Users Say Thank You to Xenios For This Useful Post:
CORSAIR (01-08-11), Easty (24-11-16), fifisrikos (09-08-14), globalklima (19-04-10), Μηδεν_ενα (18-09-10), maralin (05-02-11), Nikoscot (18-11-10), TASOS131313 (16-04-12)
  #2  
Παλιά 07-08-17, 09:51
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Τελευταία φορά Online: Σήμερα 18:51
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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.

7 Aug 2017



Spiral Galaxy NGC 1512: The Inner Ring

Image Credit: NASA, ESA, Hubble Space Telescope

Explanation: Most galaxies don't have any rings -- why does this galaxy have two? To begin, the bright band near NGC 1512's center is a nuclear ring, a ring that surrounds the galaxy center and glows brightly with recently formed stars. Most stars and accompanying gas and dust, however, orbit the galactic center in a ring much further out -- here seen near the image edge. This ring is called, counter-intuitively, the inner ring. If you look closely, you will see this the inner ring connects ends of a diffuse central bar that runs horizontally across the galaxy. These ring structures are thought to be caused by NGC 1512's own asymmetries in a drawn-out process called secular evolution. The gravity of these galaxy asymmetries, including the bar of stars, cause gas and dust to fall from the inner ring to the nuclear ring, enhancing this ring's rate of star formation. Some spiral galaxies also have a third ring -- an outer ring that circles the galaxy even further out.

Tomorrow's picture: waves of Saturn

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
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  #3  
Παλιά 13-08-17, 08:58
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Τελευταία φορά Online: Σήμερα 18:51
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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.

13 Aug 2017



Detailed View of a Solar Eclipse Corona

Image Credit & Copyright: Miloslav Druckmüller (Brno U. of Tech.), Martin Dietzel, Peter Aniol, Vojtech Rušin

Explanation: Only in the fleeting darkness of a total solar eclipse is the light of the solar corona easily visible. Normally overwhelmed by the bright solar disk, the expansive corona, the sun's outer atmosphere, is an alluring sight. But the subtle details and extreme ranges in the corona's brightness, although discernible to the eye, are notoriously difficult to photograph. Pictured here, however, using multiple images and digital processing, is a detailed image of the Sun's corona taken during the 2008 August total solar eclipse from Mongolia. Clearly visible are intricate layers and glowing caustics of an ever changing mixture of hot gas and magnetic fields. Bright looping prominences appear pink just above the Sun's limb. A similar solar corona might be visible through clear skies in a thin swath across the USA during a total solar eclipse that occurs just one week from tomorrow.

Tomorrow's picture: New Horizons over Charon

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
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  #4  
Παλιά 14-08-17, 09:02
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Τελευταία φορά Online: Σήμερα 18:51
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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.

14 Aug 2017



Charon Flyover from New Horizons

Video Credit: NASA, JHUAPL, SwRI, P. Schenk & J. Blackwell (LPI); Music: Juicy by ALBIS

Explanation: What if you could fly over Pluto's moon Charon -- what might you see? The New Horizons spacecraft did just this in 2015 July as it zipped past Pluto and Charon with cameras blazing. The images recorded allowed for a digital reconstruction of much of Charon's surface, further enabling the creation of fictitious flights over Charon created from this data. One such fanciful, minute-long, time-lapse video is shown here with vertical heights and colors of surface features digitally enhanced. Your journey begins over a wide chasm that divides different types of Charon's landscapes, a chasm that might have formed when Charon froze through. You soon turn north and fly over a colorful depression dubbed Mordor that, one hypothesis holds, is an unusual remnant from an ancient impact. Your voyage continues over an alien landscape rich with never-before-seen craters, mountains, and crevices. The robotic New Horizons spacecraft has now been targeted at Kuiper Belt object 2014 MU 69, which it should zoom past on New Year's Day 2019.

Tomorrow's picture: stars versus stardust

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
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  #5  
Παλιά 15-08-17, 09:36
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Τελευταία φορά Online: Σήμερα 18:51
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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.

15 Aug 2017



Stars, Gas, and Dust Battle in the Carina Nebula

Image Credit & Copyright: Bastien Foucher

Explanation: Chaos reigns in the Carina Nebula where massive stars form and die. Striking and detailed, this close-up of a portion of the famous nebula is a combination of light emitted by hydrogen (shown in red) and oxygen (shown in blue). Dramatic dark dust knots and complex features revealed are sculpted by the winds and radiation of Carina's massive and energetic stars. One iconic feature of the Carina Nebula is the dark V-shaped dust lane that occurs in the top half of the image. The Carina Nebula spans about 200 light years, lies about 7,500 light years distant, and is visible with binoculars toward the southern constellation of Carina. In a billion years after the dust settles -- or is destroyed, and the gas dissipates -- or gravitationally condenses, then only the stars will remain -- but not even the brightest ones.

Tomorrow's picture: interplanetary dust

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
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  #6  
Παλιά 16-08-17, 09:31
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Τελευταία φορά Online: Σήμερα 18:51
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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.

16 Aug 2017



Stars, Gas, and Dust Battle in the Carina Nebula

Image Credit & Copyright: Tamas Ladanyi (TWAN)

Explanation: Just after moonrise on August 12 this grain of cosmic sand fell by the sea, its momentary flash part of the annual Perseid Meteor Shower. To create the Perseid meteors, dust along the orbit of periodic comet Swift-Tuttle is swept up by planet Earth. The cometary debris plows through the atmosphere at nearly 60 kilometers per second and is quickly vaporized at altitudes of 100 kilometers or so. Perseid meteors are often bright and colorful, like the one captured in this sea and night skyscape. Against starry sky and faint Milky Way the serene view looks south and west across the Adriatic Sea, from the moonlit Dalmatian coast toward the island of Brac.

Tomorrow's picture: pixels in space

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
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Τελευταία επεξεργασία από το χρήστη pazo : Χθες στις 09:34
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  #7  
Παλιά Χθες, 09:28
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Τελευταία φορά Online: Σήμερα 18:51
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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.

17 Aug 2017



NGC 2442: Galaxy in Volans

Image Credit & Copyright: Tamas Ladanyi (TWAN)

Explanation: Distorted galaxy NGC 2442 can be found in the southern constellation of the flying fish, (Piscis) Volans. Located about 50 million light-years away, the galaxy's two spiral arms extending from a pronounced central bar have a hook-like appearance in wide-field images. But this mosaicked close-up, constructed from Hubble Space Telescope and European Southern Observatory data, follows the galaxy's structure in amazing detail. Obscuring dust lanes, young blue star clusters and reddish star forming regions surround a core of yellowish light from an older population of stars. The sharp image data also reveal more distant background galaxies seen right through NGC 2442's star clusters and nebulae. The image spans about 75,000 light-years at the estimated distance of NGC 2442.

Tomorrow's picture: birds of a feather

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
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Τελευταία επεξεργασία από το χρήστη pazo : Χθες στις 09:33
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  #8  
Παλιά Σήμερα, 09:17
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Τελευταία φορά Online: Σήμερα 18:51
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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.

18 Aug 2017



Perseids over the Pyrénées

Image Credit & Copyright: Jean-Francois Graffand

Explanation: This mountain and night skyscape stretches across the French Pyrenees National Park on August 12, near the peak of the annual Perseid meteor shower. The multi-exposure panoramic view was composed from the Col d'Aubisque, a mountain pass, about an hour before the bright gibbous moon rose. Centered is a misty valley and lights from the region's Gourette ski station toward the south. Taken over the following hour, frames capturing some of the night's long bright perseid meteors were aligned against the backdrop of stars and Milky Way.

Tomorrow's picture: 38 years ago

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
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