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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 23-04-17, 10:32
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Τελευταία φορά Online: Χθες 21:10
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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.

23 Apr 2017



The Holographic Principle

Image Credit: Caltech

Explanation: Is this picture worth a thousand words? According to the Holographic Principle, the most information you can get from this image is about 3 x 1065 bits for a normal sized computer monitor. The Holographic Principle, yet unproven, states that there is a maximum amount of information content held by regions adjacent to any surface. Therefore, counter-intuitively, the information content inside a room depends not on the volume of the room but on the area of the bounding walls. The principle derives from the idea that the Planck length, the length scale where quantum mechanics begins to dominate classical gravity, is one side of an area that can hold only about one bit of information. The limit was first postulated by physicist Gerard 't Hooft in 1993. It can arise from generalizations from seemingly distant speculation that the information held by a black hole is determined not by its enclosed volume but by the surface area of its event horizon. The term "holographic" arises from a hologram analogy where three-dimension images are created by projecting light though a flat screen. Beware, other people looking at the featured image may not claim to see 3 x 1065 bits -- they might claim to see a teapot.

Tomorrow's picture: ancient battle debris on Earth

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
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  #3  
Παλιά 24-04-17, 09:13
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Τελευταία φορά Online: Χθες 21:10
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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.

24 Apr 2017



A White Battle in the Black Sea

Image Credit: NASA, Aqua, MODIS

Explanation: Trillions have died in the Earth's seas. Calcified shields of the dead already make up the white cliffs of Dover. The battle between ball-shaped light-colored single-celled plants -- phytoplankton called coccolithophores -- and even smaller, diamond-shaped viruses dubbed coccolithoviruses -- has raged for tens of millions of years. To help fight this battle, the coccolithophores create their chalky armor by absorbing carbon dioxide from the atmosphere. This battle is so epic that coccolithophores actually remove a significant fraction of Earth's atmospheric carbon dioxide, bolstering the breathability of air for animals including humans. Pictured in this 2012 image from NASA's Aqua satellite, the Black Sea was turned light blue by coccolithophore blooms.

Tomorrow's picture: comet needle

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
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  #4  
Παλιά 25-04-17, 09:07
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Τελευταία φορά Online: Χθες 21:10
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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.

25 Apr 2017



A Split Ion Tail for Comet Lovejoy E4

Image Credit & Copyright: Fritz Helmut Hemmerich

Explanation: What's happened to Comet Lovejoy? In the pictured image, a processed composite, the comet was captured early this month after brightening unexpectedly and sporting a long and intricate ion tail. Remarkably, the typically complex effect of the Sun's wind and magnetic field here caused the middle of Comet Lovejoy's ion tail to resemble the head of a needle. Comet C/2017 E4 (Lovejoy) was discovered only last month by noted comet discoverer Terry Lovejoy. The comet reached visual magnitude 7 earlier this month, making it a good target for binoculars and long duration exposure cameras. What's happened to Comet Lovejoy (E4) since this image was taken might be considered even more remarkable -- the comet's nucleus appeared to be disintegrating and fading as it neared its closest approach to the Sun two days ago.

Tomorrow's picture: volcano bombs

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
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  #5  
Παλιά Χθες, 09:00
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Τελευταία φορά Online: Χθες 21:10
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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.

26 Apr 2017



Mt. Etna Lava Plume

Image Credit & Copyright: Dario Giannobile

Explanation: Mt. Etna has been erupting for hundreds of thousands of years. Located in Sicily, Italy, the volcano produces lava fountains over one kilometer high. Mt. Etna is not only one of the most active volcanoes on Earth, it is one of the largest, measuring over 50 kilometers at its base and rising nearly 3 kilometers high. Pictured in mid-March, a spectacular lava plume erupts upwards, dangerous molten volcanic bombs fly off to the sides, while hot lava flows down the volcano's exterior. The Earth's rotation is discernable on this carefully time, moon-lit, long duration image as star trails.


Tomorrow's picture: April showers

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