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Εργαλεία Θεμάτων Αξιολόγηση: Αξιολόγηση θέματος: 89 Ψήφοι, 4,94 κατά μέσο όρο. Τρόποι εμφάνισης
  #3721  
Παλιά 11-01-17, 09:54
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Τελευταία φορά Online: Σήμερα 16:18
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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.

11 January 2017



Mimas, Crater, and Mountain

Image Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA

Explanation: Mimas is an icy, crater-pocked moon of Saturn a mere 400 kilometers (250 miles) in diameter. Its largest crater Herschel is nearly 140 kilometers wide. About a third the diameter of Mimas itself, Herschel crater gives the small moon an ominous appearance, especially for scifi fans of the Death Star battlestation of Star Wars fame. In fact, only a slightly bigger impact than the one that created such a large crater on a small moon could have destroyed Mimas entirely. In this Cassini image from October 2016, the anti-Saturn hemisphere of the synchronously rotating moon is bathed in sunlight, its large crater near the right limb. Casting a long shadow across the crater floor, Herschel's central mountain peak is nearly as tall as Mount Everest on planet Earth.

Tomorrow's picture: far, far away

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
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  #3722  
Παλιά 12-01-17, 10:23
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Τελευταία φορά Online: Σήμερα 16:18
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.

12 January 2017



Edge-On NGC 891

Image Credit & Copyright: Alessandro Falesiedi

Explanation: Large spiral galaxy NGC 891 spans about 100 thousand light-years and is seen almost exactly edge-on from our perspective. In fact, about 30 million light-years distant in the constellation Andromeda, NGC 891 looks a lot like our Milky Way. At first glance, it has a flat, thin, galactic disk of stars and a central bulge cut along the middle by regions of dark obscuring dust. But remarkably apparent in NGC 891's edge-on presentation are filaments of dust that extend hundreds of light-years above and below the center line. The dust has likely been blown out of the disk by supernova explosions or intense star formation activity. Fainter galaxies can also be seen near the edge-on disk in this deep portrait of NGC 891.

Tomorrow's picture: when Neptune met Mars

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
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VmF Skisters of Mercy ©
An eye for an eye, will make us all blind... Mahatma Ghandi
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  #3723  
Παλιά 13-01-17, 09:54
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Τελευταία φορά Online: Σήμερα 16:18
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.

13 January 2017



When Mars met Neptune

Image Credit & Copyright: Stephen Mudge

Explanation: On January 1, a Mars-assisted viewing opportunity allowed binocular-equipped skygazers to cross an ice giant off their life list. Remarkably, the line-of-sight to the bright Red Planet could guide you to within 0.02 degrees of a faint, pale Neptune in Earth's night skies. Taken within 3 hours of their closest conjunction, these panels capture the odd couple's appearance in skies over Brisbane, Australia. A wide field view includes the new year's slender crescent moon near the western horizon and Venus as the brilliant evening star. Mars and Neptune are indicated at the upper right. The two inset magnified views were taken with the same telephoto lens and so do show the Mars-Neptune conjunction and the apparent size of the crescent moon at the same scale. This week Neptune hangs out near Venus on the western sky.

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
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An eye for an eye, will make us all blind... Mahatma Ghandi
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