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Εργαλεία Θεμάτων Αξιολόγηση: Αξιολόγηση θέματος: 91 Ψήφοι, 4,95 κατά μέσο όρο. Τρόποι εμφάνισης
  #61  
Παλιά 14-03-07, 08:04
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Τελευταία φορά Online: 12-11-16 10:12
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Barred Spiral Galaxy M95
Credit & Copyright: Jean-Charles Cuillandre (CFHT), Hawaiian Starlight, CFHT

Explanation: Why do some spiral galaxies have a ring around the center? First and foremost, M95 is one of the closer examples of a big and beautiful barred spiral galaxy. Visible in the above recent image from the CFHT telescope in Hawaii, USA, are sprawling spiral arms delineate by open clusters of bright blue stars, lanes of dark dust, the diffuse glow of billions of faint stars, and a short bar across the galaxy center. What intrigues many astronomers, however, is the circumnuclear ring around the galaxy center visible just outside the central bar. Recent images by the Chandra X-ray Observatory have shown that X-ray light surrounding the ring is likely emission from recent supernovas. Although the long term stability of the ring remains a topic of research, recent observations indicate its present brightness is at least enhanced by transient bursts of star formation. M95, also known as NGC 3351, spans about 50,000 light-years and can be seen with a small telescope toward the constellation of the Lion (Leo).

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  #62  
Παλιά 15-03-07, 09:13
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NGC 2442: Galaxy in Volans
Credit & Copyright: SSRO-South (D.Goldman, J.Harvey, R.Gilbert, D.Verschatse) - PROMPT (D.Reichart)

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 give it an ominous hook-shaped appearance. This striking color image also shows obscuring dust lanes, young blue star clusters and reddish star forming regions surrounding a core of yellowish light from an older population of stars. But the star forming regions seem more concentrated along the drawn-out northern (top) spiral arm. The distorted structure is likely the result of a close encounter with a smaller galaxy located just outside this telescopic field of view. The picture spans about 1/6 of a degree, or 150,000 light years at the estimated distance of NGC 2442.

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  #63  
Παλιά 15-03-07, 09:18
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Η προηγούμενη φωτογραφία σε πλήρες μέγεθος είναι εδώ αλλά όρθια (portait).
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  #64  
Παλιά 16-03-07, 15:55
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Description

The center of the well known Heart Nebula, IC 1805 is also cataloged as Melotte 15. IC 1805 lies some 7500 light years away from Earth. It is located in the Perseus arm of the Galaxy in the constellation Cassiopeia. This is an emission nebula showing glowing gas and darker dust lanes. This nebula is formed by plasma of ionized hydrogen (HII) and free electrons. The hydrogen has been ionized by ultraviolet radiation from young hot stars. The nebula thus exhibits a characteristic red spectral glow.

This image was created by combining some high-resolution RGB data taken using the SSRO RCOS telescope and an SBIG STL-11000M with some excellent narrow band (Ha/SII/OIII) data taken using a Takahashi FSQ106N and an SBIG STL-6303 by Neil Fleming in Boston, MA.

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Φωτογραφία σε μέγαλη ανάλυση εδώ
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  #65  
Παλιά 17-03-07, 09:21
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Eiffel Moon
Credit & Copyright: Frederic Tapissier

Explanation: Celestial and terrestrial lights are featured in this stunning image that includes the Moon in phases of the total lunar eclipse of March 3rd. In the foreground, the distinctively-shaped Eiffel Tower, over 300 meters tall, is a well-known tourist destination and one of the most visited buildings in the world. Of course the Moon is even more recognizable, but harder to visit. The last lunar tour was undertaken nearly 35 years ago, during the Apollo 17 mission.

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  #66  
Παλιά 19-03-07, 19:06
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Galaxy Group Hickson 44
Credit & Copyright: MASIL Imaging Team

Explanation: Galaxies, like stars, frequently form groups. A group of galaxies is a system containing more than two galaxies but less than the tens or hundreds typically found in a cluster of galaxies. A most notable example is the Local Group of Galaxies, which houses over 30 galaxies including our Milky Way, Andromeda, and the Magellanic Clouds. Pictured above is nearby compact group Hickson 44. This group is located about 60 million light-years away toward the constellation of Leo. Also known as the NGC 3190 Group, Hickson 44 contains several bright spiral galaxies and one bright elliptical galaxy on the upper left. The bright source on the upper right is a foreground star. Many galaxies in Hickson 44 and other compact groups are either slowly merging or gravitationally pulling each other apart.

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  #67  
Παλιά 20-03-07, 08:28
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A Blue Crescent Moon from Space
Credit: Expedition 13 Crew, International Space Station, NASA

Explanation: What's happening to the Moon? Drifting around the Earth in 2006 July, astronauts from the International Space Station (ISS) captured a crescent Moon floating far beyond the horizon. The captured above image is interesting because part of the Moon appears blue, and because part of the moon appears missing. Both effects are created by the Earth's atmosphere. Air molecules more efficiently scatter increasingly blue light, making the clear day sky blue for ground observers, and the horizon blue for astronauts. Besides reflecting sunlight, these atmospheric molecules also deflect moonlight, making the lower part of the moon appear to fade away. As one looks higher in the photograph, the increasingly thin atmosphere appears to fade to black.

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  #68  
Παλιά 21-03-07, 08:20
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Μεγένθυση

About this Image

NGC 891 is a classic example of an edge-on spiral galaxy bisected by a dark dust lane, seen from the side, so it's spiral structure is hidden from our line of sight. Subtle dust structures perpendicular to the disc and blue star burst areas can be seen along the plane of the galaxy. Recent observations indicate that NGC 891 may actually be a barred spiral galaxy, making it an SBb galaxy according to Hubble classification type.
The distance to NGC 891 is 9 million light years. North is to the right.

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(Και αυτή η φωτογραφία δεν είναι προτίμηση της NASA αλλα δικιά μας σαν φωτό της ημέρας.)
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  #69  
Παλιά 22-03-07, 12:43
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Goa Silhouettes

Credit & Copyright: Joerg Schoppmeyer

Ας μου επιτραπεί ένα σχόλιο, κε Schoppmeyer σας μισώ :-(

Explanation: On Moonday, March 19, shortly before the equinox, locations in Asia and the Arctic were favoured by the New Moon's shadow during a partial solar eclipse. Although the view from Goa, India found the eclipsed Sun near the horizon, photographer Joerg Schoppmeyer was still able to capture this lovely image, combining celestial with terrestrial silhouettes. The next eclipse season will begin in late August this year, featuring a total lunar eclipse on August 28, and another partial solar eclipse on September 11. Compared to the March 19th eclipse, the September 11th eclipse will be seen on the other side of our fair planet, from parts of South America and Antarctica.

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  #70  
Παλιά 23-03-07, 08:10
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Touran Sunrise
Credit & Copyright: Babak Tafreshi

Explanation: Clouds covered the eastern horizon on Monday, when the Sun rose over the expansive Touran Wildlife Reserve in northeastern Iran. Of course, on that day the Moon rose with the Sun, creating a widely enjoyed partial solar eclipse. Along with a mountainous horizon, the cloud cover lent a dramatic aspect to this eclipse sunrise and made it possible for astronomer Babak Tafreshi to record these telephoto images without using a filter. Advancing north in planet Earth's sky, the Sun itself was also approaching the equinox, the astronomical marker for the first day of northern hemisphere spring and the beginning of Norouz, the Persian New Year.

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  #71  
Παλιά 23-03-07, 12:35
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Τελευταία φορά Online: 08-05-17 14:17
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Η διαθεσή μου τώρα:
Οταν μεγαλωσεις Στελιο, θα βγαζεις καλυτερες φωτο απο αυτον τον πως τον λενε :Ρ
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  #72  
Παλιά 24-03-07, 07:35
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Lisbon Moonset
Credit & Copyright: Miguel Claro

Explanation: Brilliant Venus, a slender crescent Moon, and lights along the Ponte 25 de Abril glow against the western twilight in this lovely moonset scene from Lisbon, Portugal, recorded on March 20. In fact, such serene views were enjoyed across planet Earth this week, as the young Moon remained near the setting Sun following a partial solar eclipse, and Venus ruled as the evening star. Because of strong Earthshine - light from the sunlit Earth - even the Moon's night side is clearly visible in the picture. The Ponte 25 de Abril is a 2.3 kilometer long suspension bridge across the Tagus river, often compared to the Golden Gate bridge in San Francisco, USA.

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  #73  
Παλιά 25-03-07, 09:44
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Κάντε κλικ πάνω στην φωτογραφία για να δείτε την πλέον κλασική φωτογραφία της Γης, για πρώτη φορά σε μεγάλη ανάλυση.

Welcome to Planet Earth
Credit: Apollo 17 Crew, NASA

Explanation: Welcome to Planet Earth, the third planet from a star named the Sun. The Earth is shaped like a sphere and composed mostly of rock. Over 70 percent of the Earth's surface is water. The planet has a relatively thin atmosphere composed mostly of nitrogen and oxygen. The above picture of Earth, dubbed Blue Marble, was taken from Apollo 17 in 1972 and features Africa and Antarctica. It is thought to be one of the most widely distributed photographs of any kind. Earth has a single large Moon that is about 1/4 of its diameter and, from the planet's surface, is seen to have almost exactly the same angular size as the Sun. With its abundance of liquid water, Earth supports a large variety of life forms, including potentially intelligent species such as dolphins and humans. Please enjoy your stay on Planet Earth.

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  #74  
Παλιά 26-03-07, 08:34
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(Κάντε κλικ στην φωτογραφία για μεγένθυση)

Bullet Pillars in Orion
Credit & Copyright: Gemini Observatory, AURA, NSF

Explanation: Why are bullets of gas shooting out of the Orion Nebula? Nobody is yet sure. First discovered in 1983, each bullet is actually about the size of our Solar System, and moving at about 400 km/sec from a central source dubbed IRc2. The age of the bullets, which can be found from their speed and distance from IRc2, is very young -- typically less than 1,000 years. As the bullets rip through the interior of the Orion Nebula, a small percentage of iron gas causes the tip of each bullet to glow blue, while each bullet leaves a tubular pillar that glows by the light of heated hydrogen gas. Pictured above, the Orion bullets were captured in unprecedented detail by the adaptive optics technology of the Gemini North telescope. M42, the Orion Nebula, is the closest major star forming region to us and filled with changing dust, gas, and bright stars. The Orion Nebula, is located about 1,500 light years away and can be seen with the unaided eye toward the constellation of Orion.

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  #75  
Παλιά 27-03-07, 09:07
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Enceladus Creates Saturn's E Ring
Credit: CICLOPS, JPL, ESA, NASA

Explanation: The active moon Enceladus appears to be making Saturn's E ring. An amazing picture showing the moon at work was taken late last year by the Saturn-orbiting Cassini spacecraft and is shown above. Enceladus is the bright point near the center, right near the center of Saturn's E ring. Streams of ice and water vapor can be seen pouring off Enceladus into the E ring. The above bright image of the normally faint E-ring was made possible by aligning Cassini so that Saturn blocked the Sun. From that perspective, small ring particles reflect incoming sunlight more efficiently. Cassini has now been orbiting Saturn for almost three years, and is scheduled to swoop by the unexpectedly cryovolcanic Enceladus at least several more times.

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