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Εργαλεία Θεμάτων Τρόποι εμφάνισης
  #1681  
Παλιά 21-05-11, 08:52
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Τελευταία φορά Online: 12-11-16 10:12
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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 May 21

Κάντε κλικ στην φωτογραφία για μεγάλη ανάλυση
Planets, Endeavour at Dawn

Image Credit & Copyright: Daniel Herron (Atlanta Astronomy Club)
Explanation: When dawn broke over Kennedy Space Center on Monday, May 16, the space shuttle orbiter Endeavour still stood on pad 39A. Its final launch, on mission STS-134 to the International Space Station, was only hours away. Shining through the early morning twilight four planets were also poised above the eastern horizon, a moving scene captured here from across the Banana River at the center's Saturn V VIP viewing site. Scattered by planet Earth's dense atmosphere, floodlight beams play over the launch pad, glancing skyward toward the celestial beacons. Jupiter is highest, near the top of the frame, but even the solar sytem's ruling gas giant is outshone by brilliant Venus near picture center. Innermost planet Mercury is below Venus, to the right. Below and left, Mars almost fades into the twilight glow. The four planets continue to hug the eastern horizon at dawn throughout the month, while Endeavour is now scheduled to make its final approach to planet Earth on June 1.

Tomorrow's picture: lava world

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  #1682  
Παλιά 22-05-11, 08:59
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Τελευταία φορά Online: 12-11-16 10:12
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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 May 22

Io: The Prometheus Plume
Credit: Galileo Project, JPL, NASA
Κάντε κλικ στην φωτογραφία για μεγάλη ανάλυσηExplanation: What's happening on Jupiter's moon Io? Two sulfurous eruptions are visible on Jupiter's volcanic moon Io in this color composite image from the robotic Galileo spacecraft that orbited Jupiter from 1995 to 2003. At the image top, over Io's limb, a bluish plume rises about 140 kilometers above the surface of a volcanic caldera known as Pillan Patera. In the image middle, near the night/day shadow line, the ring shaped Prometheus plume is seen rising about 75 kilometers above Io while casting a shadow below the volcanic vent. Named for the Greek god who gave mortals fire, the Prometheus plume is visible in every image ever made of the region dating back to the Voyager flybys of 1979 - presenting the possibility that this plume has been continuously active for at least 18 years. The above digitally sharpened image of Io was originally recorded in 1997 from a distance of about 600,000 kilometers. Recent analyses of Galileo data has uncovered evidence of a magma ocean beneath Io's surface.

Tomorrow's picture: crab flare

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  #1683  
Παλιά 23-05-11, 08:17
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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 May 23

An Unexpected Flare from the Crab Nebula
Credit: NASA, DOE, Fermi LAT, R. Buehler (SLAC, KIPAC)
Explanation: Why does the Crab Nebula flare? No one is sure. The unusual behavior, discovered over the past few years, seems only to occur in very high energy light -- gamma rays. As recently as one month ago, gamma-ray observations of the Crab Nebula by the Fermi Gamma Ray Space Telescope showed an unexpected increase in gamma-ray brightness, becoming about five times the nebula's usual gamma-ray brightness, and fading again in only a few days. Now usually the faster the variability, the smaller the region involved. This might indicate that the powerful pulsar at the center of the Crab, a compact neutron star rotating 30 times a second, is somehow involved. Specifically, speculation is centered on the changing magnetic field that surely surrounds the powerful pulsar. Rapid changes in this field might lead to waves of rapidly accelerated electrons which emit the flares, possibly in ways similar to our Sun. The above image shows how the Crab Nebula normally appears in gamma rays, as compared to the Geminga pulsar, and how it then appeared during the recent brightening.

Tomorrow's picture: open space

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  #1684  
Παλιά 24-05-11, 08:39
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Τελευταία φορά Online: 12-11-16 10:12
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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 May 24

Three Arches Above Utah
Credit & Copyright: Brad Goldpaint (Goldpaint Photography)
Explanation: How many arches can you count in the above image? If you count both spans of the Double Arch in the Arches National Park in Utah, USA, then two. But since the above image was taken during a clear dark night, it caught a photogenic third arch far in the distance -- that of the overreaching Milky Way Galaxy. Because we are situated in the midst of the spiral Milky Way Galaxy, the band of the central disk appears all around us. The sandstone arches of the Double Arch were formed from the erosion of falling water. The larger arch rises over 30 meters above the surrounding salt bed and spans close to 50 meters across. The dark silhouettes across the image bottom are sandstone monoliths left over from silt-filled crevices in an evaporated 300 million year old salty sea. A dim flow created by light pollution from Moab, Utah can also be seen in the distance.

Tomorrow's picture: galaxy jets

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Οι παρακάτω χρήστες έχουν πει 'Ευχαριστώ' στον/στην Xenios για αυτό το μήνυμα:
Gildor (24-05-11)
  #1685  
Παλιά 25-05-11, 08:40
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Τελευταία φορά Online: 12-11-16 10:12
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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 May 25

Space Shuttle Rising
Credit: NASA
Explanation: What's that rising from the clouds? The space shuttle. If you looked out the window of an airplane at just the right place and time last week, you could have seen something very unusual -- the space shuttle Endeavour launching to orbit. Images of the rising shuttle and its plume became widely circulated over the web shortly after Endeavour's final launch. The above image was taken from a shuttle training aircraft and is not copyrighted. Taken well above the clouds, the image can be matched with similar images of the same shuttle plume taken below the clouds. Hot glowing gasses expelled by the engines are visible near the rising shuttle, as well as a long smoke plume. A shadow of the plume appears on the cloud deck, indicating the direction of the Sun. The shuttle Endeavour remains docked with the International Space Station and is currently scheduled to return to Earth next week.

Tomorrow's picture: open space

Πηγή

Σχόλιο : Το timing που λέγαμε Βασίλη μου
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  #1686  
Παλιά 25-05-11, 17:52
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Οργανωτής Club
 

Τελευταία φορά Online: 15-01-17 16:24
Φύλο: Άντρας
Η διαθεσή μου τώρα:
Αυτή την φωτογραφία την είχα δει πρίν μερικές μέρες στο BBC και έλεγε οτι την τράβηξε μια γυναίκα μέσα από το αεροπλάνο στο οποίο πετούσε και όπου μόλις είχε ξυπνήσει.
Καμία σχέση με αυτά που γράφουν από την NASA
__________________
"We are all in the gutter, but some of us are looking at the stars." Oscar Wilde
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  #1687  
Παλιά 26-05-11, 09:10
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Τελευταία φορά Online: 12-11-16 10:12
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 May 26

Supernova Sonata
Title Image: Kepler's Supernova Remnant - Chandra (X-ray) / HST (Optical) / Spitzer (IR)
Credit: Alex H. Parker (Univ. Victoria), Melissa L. Graham (Univ. California, Santa Barbara / LCOGT)
Explanation: To create a sonata from supernovae, first you have to find the supernovae. To do that composers Alex Parker and Melissa Graham relied on the Canada France Hawaii Telescope (CFHT) Legacy Survey data of four deep fields on the sky monitored from April 2003 through August 2006, adopting 241 Type Ia supernovae. Enchanting to cosmologists, Type Ia supernovae are thermonuclear explosions that destroy white dwarf stars. Then, they gave each supernova a note to play, the volume of the note determined by the distance to the supernova. Fainter, more distant supernovae play quieter notes. Each note's pitch was based on a stretch factor measured by how fast the supernova brightens and fades over time relative to an adopted standard time history. Higher stretch factors play higher notes in pitches drawn from the illustrated Phrygian dominant scale. Of course, each supernova note is played on an instrument. Supernovae in massive galaxies were assigned to a stand-up bass, while supernovae in less massive galaxies played their note on a grand piano. Click on the image or follow these links (Vimeo, YouTube) to watch a time compressed animation of the CFHT Legacy Survey data while listening to the Supernova Sonata.

Tomorrow's picture: the sky gazer's marathon

Πηγή

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  #1688  
Παλιά 27-05-11, 08:01
Το avatar του χρήστη Xenios
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Τελευταία φορά Online: 12-11-16 10:12
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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 May 27


Messier Marathon
Image Credit & Copyright: Babak Tafreshi (TWAN)
Explanation: In this action scene, red night vision lights, green laser pointers, tripods and telescopes in faint silhouette surround intrepid sky gazers embarked on the 10th annual Iran Messier Marathon. Completing the marathon requires viewing all 110 objects in 18th century French astronomer Charles Messier's catalog in one glorious dusk-to-dawn observing run. As daunting as it sounds, there are often favorable weekend dates for northern hemisphere marathoners to complete the task that fall on nearly moonless nights near the spring equinox. With the Milky Way as a backdrop, this group of about 150 astronomy enthusiasts conducted their 2011 marathon on such a night in April from the desert area of Seh Qaleh, in eastern Iran. Placing your cursor over the image will map the stunning night sky above their remote and very dark observing site. Follow the green laser pointer toward the Messier catalog objects (for example, M8) near the galactic center. Astronomer and former Messier Marathon organizer Babak Tafreshi also composed Sky Gazers, a time-lapse movie of this year's event.

Help APOD: Join the APOD Image Chasers Group
Tomorrow's picture: check the odometer

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Τελευταία επεξεργασία από το χρήστη Xenios : 27-05-11 στις 08:05
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  #1689  
Παλιά 28-05-11, 08:23
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Τελευταία φορά Online: 12-11-16 10:12
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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 May 28

The Mileage of Light
Composite Image Credit & Copyright: Dennis L. Mammana (TWAN)
Explanation: If you're driving down a dark road on a starry night, you might want to check the odometer. Earlier this month, when traveling astronomer Dennis Mammana did he was greeted with the significant mileage reading of 186,282 miles. That's the number of miles light travels in one second. Or, if you prefer kilometers, the number you are looking for is 299,792. Mammana muses that in driving to countless observatories, star parties, and night sky photo shoots it has taken his 1998 vintage sport utility vehicle over 13 years to cover that distance. Of course, he considers his next important mileage milestone to be the distance to the Moon.

Tomorrow's picture: triple sky

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  #1690  
Παλιά 29-05-11, 09:47
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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 May 29

Κάντε κλικ στην φωτογραφία για μεγάλη ανάλυση

Comet Between Fireworks and Lightning
Credit & Copyright: Antti Kemppainen
Explanation: Sometimes the sky itself is the best show in town. In January 2007, people from Perth, Australia gathered on a local beach to watch a sky light up with delights near and far. Nearby, fireworks exploded as part of Australia Day celebrations. On the far right, lightning from a thunderstorm flashed in the distance. Near the image center, though, seen through clouds, was the most unusual sight of all: Comet McNaught. The photogenic comet was so bright that it even remained visible though the din of Earthly flashes. Comet McNaught has now returned to the outer Solar System and is now only visible with a large telescope. The above image is actually a three photograph panorama digitally processed to reduce red reflections from the exploding firework.

Tomorrow's picture: spirit's last stand

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Σχόλιο : !!!
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  #1691  
Παλιά 30-05-11, 08:38
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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 May 30

Last Panorama of the Spirit Rover on Mars
Credit: Mars Exploration Rover Mission, NASA, JPL, Cornell; Image Processing: Kenneth Kremer, Marco Di Lorenzo
Explanation: This is the last thing that the Spirit rover on Mars ever saw. Operating years beyond original expectations, Spirit eventually got mired in martian dirt and then ran out of power when investigating the unusual Home Plate surface feature on Mars. Visible in the above panorama are numerous rocks and slopes of the surrounding Columbia Hills of Mars. The strange hill with the light colored top, visible near the top center of the image, has been dubbed von Braun and was a future destination when Spirit got bogged down. A leading hypothesis holds that von Braun is related to martian volcanism. Last week, NASA stopped trying to contact Spirit after numerous attempts. Half a world away, Spirit's sister rover Opportunity continues to roll toward Endeavour Crater, which could become the largest crater yet visited by an earthling-created robot.

Tomorrow's picture: inner jet

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  #1692  
Παλιά 31-05-11, 08:45
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Τελευταία φορά Online: 12-11-16 10:12
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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 May 31

Jets from Unusual Galaxy Centaurus A
Credit: ESO/WFI (visible); MPIfR/ESO/APEX/A. Weiss et al. (microwave); NASA/CXC/CfA/R. Kraft et al. (X-ray); Inset: NASA/TANAMI/C. Müller et al. (radio)
Explanation: Jets of streaming plasma expelled by the central black hole of a massive spiral galaxy light up this composite image of Centaurus A. The jets emanating from Cen A are over a million light years long. Exactly how the central black hole expels infalling matter is still unknown. After clearing the galaxy, however, the jets inflate large radio bubbles that likely glow for millions of years. If excited by a passing front, radio bubbles can even light up again after a billion years. X-ray light is depicted in the above composite image in blue, while microwave light is false-colored orange. The inset image in radio light shows newly imaged, never seen-before details of the innermost light year of the central jet.

Tomorrow's picture: open space

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  #1693  
Παλιά 01-06-11, 08:29
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Τελευταία φορά Online: 12-11-16 10:12
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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 June 1


Earth Rotating Under Very Large Telescopes
Credit: S. Guisard & J. F. Salgado, ESO, Bulletpeople.com; Music: Arcadia (Licence: Kevin Macleod)
Explanation: Why is the Earth moving in the above video? Most time lapse videos of the night sky show the stars and sky moving above a steady Earth. Here, however, the frames have been digitally rotated so that it is the stars that stay (approximately) steady, and the Earth that moves beneath them. The video dramatically shows the actual rotation of the Earth, called diurnal motion, in a clear and moving way, as if the camera were floating free in space. The telescopes featured in the video are the Very Large Telescopes (VLT) in Chile, a group of four of the largest optical telescopes deployed anywhere in the world. A discerning observer of the above time lapse movie may also note the use of laser guide stars, zodiacal light, the Large and Small Magellanic Clouds, and fast-moving, sunlight-reflecting, Earth-orbiting satellites. The original video, on which the above sequences are based, can be found here.

Tomorrow's picture: open space

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  #1694  
Παλιά 02-06-11, 08:35
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Τελευταία φορά Online: 12-11-16 10:12
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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 June 2

Endeavour's Starry Night
Credit: ISS Expedition 28, STS-134, NASA
Explanation: This luminous night view of the space shuttle orbiter Endeavour, docked with the International Space Station for a final time, was captured on May 28. Orbiting 350 kilometers above planet Earth, Endeavour's payload bay is lit up as it hurtles through Earth's shadow at 27,000 miles per hour. At the top of the frame, the jointed appendages of the station's robotic manipulator arm Dextre appear in silhouette. Motion during the long exposure produced streaks in the starry background and the city lights on the darkened planet below. Completing a 16 day mission, Endeavour made a it's final landing at Kennedy Space Center in the dark, early morning hours of June 1.

Tomorrow's picture: pixels in space

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  #1695  
Παλιά 03-06-11, 08:06
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Τελευταία φορά Online: 12-11-16 10:12
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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 June 3

Midnight's Solar Eclipse
Credit & Copyright: Catalin Beldea (Stiinta si Tehnica Team)
Explanation: On June 1, the shadow of the New Moon was cast across a land of the midnight Sun in this year's second partial solar eclipse. This picture of the geocentric celestial event above the Arctic Circle was taken near midnight from northern Finland's Kaunispää Hill in Lapland. Of course the region's reindeer were able to watch as both Moon and Sun hugged the northern horizon just above a cloud bank. Also visible from parts of Alaska and Canada, the eclipse began at sunrise in Siberia and northern China at 19:25 UT, ending about 3.5 hours later north of Newfoundland in the Atlantic Ocean. Remarkably, just one lunation later, on July 1 the New Moon's shadow will again reach out and touch the Earth in a partial solar eclipse, limited in visibility to a relatively small area in the Antarctic Ocean. July's eclipse will be followed by the fourth and final partial solar eclipse of 2011 on November 25. That eclipse will be seen from a southern land of the midnight Sun.

Tomorrow's picture: dawn's grand finale

Πηγή

Σχόλιο : Αξίζει να δει κανείς μία φορά στην ζωή του, τον ήλιο του μεσονυκτίου, τώρα αν αυτός έχει και μερική έκλειψη, θα πρέπει να είναι κάτι το μοναδικό.
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