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Εργαλεία Θεμάτων Τρόποι εμφάνισης
  #2971  
Παλιά 25-11-14, 10:31
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Τελευταία φορά Online: 12-11-16 11:12
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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.
2014 November 25

The Creature from the Red Lagoon
Image Credit & Copyright: Derek Demeter (Emil Buehler Planetarium)
Explanation: What creature lurks near the red Lagoon nebula? Mars. This gorgeous color deep-sky photograph has captured the red planet passing below two notable nebulae -- cataloged by the 18th century cosmic registrar Charles Messier as M8 and M20. M20 (upper right of center), the Trifid Nebula, presents a striking contrast in red/blue colors and dark dust lanes. Just below and to the left is the expansive, alluring red glow of M8, the Lagoon Nebula. Both nebulae are a few thousand light-years distant. By comparison, temporarily situated below them both, is the dominant "local" celestial beacon Mars. Taken late last month while near its closest approach to the Earth, the red planet was only a few light-minutes away.
Now Available: APOD 2015 Wall Calendars
Tomorrow's picture: Io-Callisto

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  #2972  
Παλιά 26-11-14, 09:53
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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.
2014 November 26

Io and Callisto Mutual Event
Image Credit & Copyright: Marco Guidi
Explanation: A 24 minute sequence from top to bottom, this intriguing series of telescopic frames tracks the occultation of Io by Callisto, two of Jupiter's Galilean moons, from San Pietro Polesine, Italy, planet Earth. A challenging observational project using a small telescope, the two contrasting Jovian worlds are both slightly larger than Earth's Moon. In fact, bright, volcanic Io and dark, cratered Callisto are about 3,640 and 4,820 kilometers in diameter respectively. With Earth itself now crossing near the orbital plane of Jupiter's moons, astronomers are enjoying a season of Galilean moon mutual events ranging from eclipses to occultations. The series of orbital plane crossings produce a mutual event season every 5 to 6 years.
Tomorrow's picture: ocean world

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  #2973  
Παλιά 27-11-14, 11:06
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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.
2014 November 27

Galileo's Europa Remastered
Image Credit: NASA, JPL-Caltech, SETI Institute, Cynthia Phillips, Marty Valenti
Explanation: Looping through the Jovian system in the late 1990s, the Galileo spacecraft recorded stunning views of Europa and uncovered evidence that the moon's icy surface likely hides a deep, global ocean. Galileo's Europa image data has been newly remastered here, using improved new calibrations to produce a color image approximating what the human eye might see. Europa's long curving fractures hint at the subsurface liquid water. The tidal flexing the large moon experiences in its elliptical orbit around Jupiter supplies the energy to keep the ocean liquid. But more tantalizing is the possibility that even in the absence of sunlight that process could also supply the energy to support life, making Europa one of the best places to look for life beyond Earth. What kind of life could thrive in a deep, dark, subsurface ocean? Consider planet Earth's own extreme shrimp.
Tomorrow's picture: portrait of pacman

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  #2974  
Παλιά 28-11-14, 10:00
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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.
2014 November 28

Portrait of NGC 281
Image Credit & Copyright: Martin Pugh
Explanation: Look through the cosmic cloud cataloged as NGC 281 and you might miss the stars of open cluster IC 1590. But, formed within the nebula, that cluster's young, massive stars ultimately power the pervasive nebular glow. The eye-catching shapes looming in this portrait of NGC 281 are sculpted columns and dense dust globules seen in silhouette, eroded by intense, energetic winds and radiation from the hot cluster stars. If they survive long enough, the dusty structures could also be sites of future star formation. Playfully called the Pacman Nebula because of its overall shape, NGC 281 is about 10,000 light-years away in the constellation Cassiopeia. This sharp composite image was made through narrow-band filters, combining emission from the nebula's hydrogen, sulfur, and oxygen atoms in green, red, and blue hues. It spans over 80 light-years at the estimated distance of NGC 281.
Tomorrow's picture: 3D C67/P

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  #2975  
Παλιά 29-11-14, 11:08
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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.
2014 November 29

3D 67P
Image Credit: ESA/Rosetta/Philae/ROLIS
Explanation: Get out your red/blue glasses and float next to a comet! The Rosetta mission lander Philae's ROLIS camera snapped the two frames used to create this stereo anaglyph for 3D viewing during its November 12 descent to the nucleus of Comet 67P/Churyumov-Gerasimenko. The comet's curious double lobed nucleus is seen nearly end on from a distance of about 3 kilometers, about 1 hour before Philae arrived at the surface. Philae's initial landing site is near the center of the front facing lobe. Part of a landing gear foot cuts across the upper right corner, in the close foreground of the 3D-view. Philae bounced twice in the comet's weak gravity after its first contact with the surface. Using high resolution camera images from the Rosetta orbiter along with data from the lander's instruments, controllers have followed Philae's impromptu journey over the comet's surface and have identified a likely area for its final resting place.
Tomorrow's picture: The Seahorse of the LMC

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  #2976  
Παλιά 30-11-14, 10:38
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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.
2014 November 30

The Seahorse of the Large Magellanic Cloud
Image Credit: NASA, ESA, and M. Livio (STScI)
Explanation: It may look like a grazing seahorse, but the dark object toward the image right is actually a pillar of smoky dust about 20 light years long. The curiously-shaped dust structure occurs in our neighboring Large Magellanic Cloud, in a star forming region very near the expansive Tarantula Nebula. The energetic nebula is creating a star cluster, NGC 2074, whose center is visible just off the top of the image in the direction of the neck of the seahorse. The representative color image was taken last year by the Hubble Space Telescope's Wide Field Planetary Camera 2 in honor of Hubble's 100,000th trip around the Earth. As young stars in the cluster form, their light and winds will slowly erode the dust pillars away over the next million years.
Now Available: APOD 2015 Wall Calendars
Tomorrow's picture: stars and dust

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  #2977  
Παλιά 01-12-14, 09:53
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Astronomy Picture of the Day

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2014 December 1

Stars and Dust Pillars in NGC 7822 from WISE
Image Credit: WISE, IRSA, NASA; Processing & Copyright : Francesco Antonucci
Explanation: Hot, young stars and cosmic pillars of gas and dust seem to crowd into NGC 7822. At the edge of a giant molecular cloud toward the northern constellation Cepheus, this glowing star forming region lies about 3,000 light-years away. Within the nebula, bright edges and complex dust sculptures dominate this detailed skyscape taken in infrared light by NASA's Wide Field Infrared Survey Explorer (WISE) satellite. The atomic emission by the cluster's gas is powered by energetic radiation from the hot stars, whose powerful winds and light also sculpt and erode the denser pillar shapes. Stars could still be forming inside the pillars by gravitational collapse, but as the pillars are eroded away, any forming stars will ultimately be cut off from their reservoir of star stuff. This field spans around 40 light-years at the estimated distance of NGC 7822.
Now Available: APOD 2015 Wall Calendars
Tomorrow's picture: expanding cloud

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  #2978  
Παλιά 02-12-14, 10:00
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Τελευταία φορά Online: 12-11-16 11:12
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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.
2014 December 2

Eta Carinae and the Expanding Homunculus Nebula
Image Credit: Hubble, NASA, ESA; Processing & Copyright: First Light, J. L. Dauvergne, P. Henarejos
Explanation: How did the Eta Carinae star system create this unusual expanding nebula? No one knows for sure. About 170 years ago, the southern star system Eta Carinae (Eta Car) mysteriously became the second brightest star system in the night sky. Twenty years later, after ejecting more mass than our Sun, Eta Car unexpectedly faded. Somehow, this outburst appears to have created the Homunculus Nebula. The three-frame video features images of the nebula taken by the Hubble Space Telescope in 1995, 2001, and 2008. The Homonculus nebula's center is lit by light from a bright central star, while the surrounding regions are expanding lobes of gas laced with filaments of dark dust. Jets bisect the lobes emanating from the central stars. Expanding debris includes streaming whiskers and bow shocks caused by collisions with previously existing material. Eta Car still undergoes unexpected outbursts, and its high mass and volatility make it a candidate to explode in a spectacular supernova sometime in the next few million years.
Tomorrow's picture: remember when

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  #2979  
Παλιά 03-12-14, 10:16
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Τελευταία φορά Online: 12-11-16 11:12
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Astronomy Picture of the Day

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2014 December 2

Sharpless 249 and the Jellyfish Nebula
Image Credit & Copyright: César Blanco González
Explanation: Normally faint and elusive, the Jellyfish Nebula is caught in this alluring telescopic mosaic. The scene is anchored right and left by two bright stars, Mu and Eta Geminorum, at the foot of the celestial twin while the Jellyfish Nebula is the brighter arcing ridge of emission with dangling tentacles below and right of center. In fact, the cosmic jellyfish is part of bubble-shaped supernova remnant IC 443, the expanding debris cloud from a massive star that exploded. Light from the explosion first reached planet Earth over 30,000 years ago. Like its cousin in astrophysical waters the Crab Nebula supernova remnant, the Jellyfish Nebula is known to harbor a neutron star, the remnant of the collapsed stellar core. An emission nebula cataloged as Sharpless 249 fills the field at the upper left. The Jellyfish Nebula is about 5,000 light-years away. At that distance, this narrowband composite image would be about 300 light-years across.
Tomorrow's picture: pixels in space

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  #2980  
Παλιά 04-12-14, 10:12
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Astronomy Picture of the Day

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2014 December 4

Plato and the Lunar Alps
Image Credit & Copyright: Richard Bosman
Explanation: The dark-floored, 95 kilometer wide crater Plato and sunlit peaks of the lunar Alps (Montes Alpes) are highlighted in this sharp digital snapshot of the Moon's surface. While the Alps of planet Earth were uplifted over millions of years as continental plates slowly collided, the lunar Alps were likely formed by a sudden collision that created the giant impact basin known as the Mare Imbrium or Sea of Rains. The mare's generally smooth, lava-flooded floor is seen below the boardering mountain range. The prominent straight feature cutting through the mountains is the lunar Alpine Valley (Vallis Alpes). Joining the Mare Imbrium and northern Mare Frigoris (Sea of Cold) the valley extends toward the upper right, about 160 kilometers long and up to 10 kilometers wide. Of course, the large, bright alpine mountain below and right of the valley is named Mont Blanc. The tallest of the lunar Alps, it reaches over 3 kilometers above the surface. Lacking an atmosphere, not to mention snow, the lunar Alps are probably not an ideal location for a winter vacation. Still, a 150 pound skier would weigh a mere 25 pounds on the Moon.
News: Orion Flight Coverage
Tomorrow's picture: looking up

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  #2981  
Παλιά 05-12-14, 10:03
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Τελευταία φορά Online: 12-11-16 11:12
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Astronomy Picture of the Day

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2014 December 5

Milky Way over Moon Valley
Image Credit & Copyright: Rafael Defavari
Explanation: Our Milky Way Galaxy arcs over a desolate landscape in this fantastic panoramic night skyview. The otherworldly scene looks across the arid, eroded terrain of the Valle de la Luna in the Chilean Atacama desert. Just along the horizon are lights from San Pedro, Chile, as well as the small villages of Socaire and Toconao, and a torturous winding road from the city of Calama to San Pedro. Taken on October 18th, the five panel mosaic also features the four galaxies easily visible from our fair planet's dark sky regions. At the far left, satellite galaxies known as the Large and Small Magellanic Clouds are framed by their terrestrial namesakes. Much fainter and at the right, beyond the Milky Way's central bulge, is the Andromeda Galaxy. The most distant in view, Andromeda lies some 2.5 million light-years away.
News: Orion Flight Coverage
Tomorrow's picture: light-weekend

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  #2982  
Παλιά 06-12-14, 10:19
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Astronomy Picture of the Day

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2014 December 6

Orion Launch
Image Credit: NASA, Bill Ingalls
Explanation: Headed for two orbits of planet Earth and a splashdown in the Pacific, Orion blazed into the early morning sky on Friday at 7:05am ET. The spacecraft was launched atop a United Launch Aliance Delta IV Heavy rocket from Cape Canaveral Air Force Station in Florida. Its first voyage into space on an uncrewed flight test, the Orion traveled some 3,600 miles from Earth, about 15 times higher than the orbital altitude of the International Space Station. In fact, Orion traveled farther into space than any spacecraft designed for astronauts since the Apollo missions to the Moon. The Orion crew module reached speeds of 20,000 miles per hour and temperatures approaching 4,000 degrees Fahrenheit as it re-entered Earth's atmosphere about 4.5 hours after launch.
Tomorrow's picture: shimmer and flash

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  #2983  
Παλιά 08-12-14, 10:37
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Astronomy Picture of the Day

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2014 December 8


Wanderers
Video Credit: Visuals: Erik Wernquist; Music: Christian Sandquist Words & Voice: Carl Sagan
Explanation: How far out will humanity explore? If this video's fusion of real space imagery and fictional space visualizations is on the right track, then at least the Solar System. Some of the video's wondrous sequences depict future humans drifting through the rings of Saturn, exploring Jupiter from a nearby spacecraft, and jumping off a high cliff in the low gravity of a moon of Uranus. Although no one can know the future, wandering and exploring beyond boundaries -- both physical and intellectual -- is part of the human spirit and has frequently served humanity well in the past.
Tomorrow's picture: hunter's flame

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  #2984  
Παλιά 09-12-14, 10:37
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Τελευταία φορά Online: 12-11-16 11:12
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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.
2014 December 9

The Flame Nebula in Visible and Infrared
Image Credit & Copyright: Optical (RGB+Ha): Aldo Mottino & Ezequiel Bellocchio (Argentina); Infrared: ESO/J. Emerson/VISTA.
Explanation: What lights up the Flame Nebula? Fifteen hundred light years away towards the constellation of Orion lies a nebula which, from its glow and dark dust lanes, appears, on the left, like a billowing fire. But fire, the rapid acquisition of oxygen, is not what makes this Flame glow. Rather the bright star Alnitak, the easternmost star in the Belt of Orion visible just to the right of the nebula, shines energetic light into the Flame that knocks electrons away from the great clouds of hydrogen gas that reside there. Much of the glow results when the electrons and ionized hydrogen recombine. The above false-color picture of the Flame Nebula (NGC 2024) was taken is a composite of both visible and infrared light, the later energy band being where a young star cluster becomes visible. The Flame Nebula is part of the Orion Molecular Cloud Complex, a star-forming region that includes the famous Horsehead Nebula.
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Tomorrow's picture: redder

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  #2985  
Παλιά 10-12-14, 10:23
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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.
2014 December 10

The Reddening of M71
Image Credit & Copyright: Bob Franke
Explanation: Now known to be a globular star cluster at the tender age of 10 billion years, M71 is a mere 13,000 light-years away within the narrow boundaries of the faint constellation Sagitta. Close to the plane of the Milky Way galaxy in planet Earth's sky, its 10,000 or so member stars are gathered into a region about 27 light-years across near the center of this color composite view. In fact, the line-of-sight to M71 passes along the galactic plane through much intervening diffuse interstellar dust. The dust dims starlight and scatters blue light more efficiently, masking the brightness of M71's stars and shifting true star colors toward the red. How much are the star colors shifted? Slide your cursor over the image (or follow this link) to use an estimate of the dust reddening or galactic extinction to correct the star colors in M71. Corrections to the brightness and colors of M71 member stars are needed to measure the cluster's distance and age using a Color-Magnitude diagram.
Tomorrow's picture: moon dog night

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