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Εργαλεία Θεμάτων | Τρόποι εμφάνισης |
#3721
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Astronomy Picture of the Day 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.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 Tomorrow's picture: far, far away 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 |
#3722
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Astronomy Picture of the Day 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.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 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 |
#3723
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Astronomy Picture of the Day 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.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 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 |
#3724
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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. 15 January 2017 The Matter of the Bullet Cluster Image Credit: X-ray: NASA/CXC/CfA/ M. Markevitch et al. Explanation: What's the matter with the Bullet Cluster? This massive cluster of galaxies (1E 0657-558) creates gravitational lens distortions of background galaxies in a way that has been interpreted as strong evidence for the leading theory: that dark matter exists within. Different recent analyses, though, indicate that a less popular alternative -- modifying gravity-- could explain cluster dynamics without dark matter, and provide a more likely progenitor scenario as well. Currently, the two scientific hypotheses are competing to explain the observations: it's invisible matter versus amended gravity. The duel is dramatic as a clear Bullet-proof example of dark matter would shatter the simplicity of modified gravity theories. For the near future, the battle over the Bullet cluster is likely to continue as new observations, computer simulations, and analyses are completed. The featured image is a Hubble/Chandra/Magellan composite with red depicting the X-rays emitted by hot gas, and blue depicting the suggested separated dark matter distribution. Tomorrow's picture: orion streaming 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 |
#3725
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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. 16 January 2017 Geostationary Highway through Orion Image Credit & Copyright: James A. DeYoung Explanation: Put a satellite in a circular orbit about 42,000 kilometers from the center of the Earth and it will orbit once in 24 hours. Because that matches Earth's rotation period, it is known as a geosynchronous orbit. If that orbit is also in the plane of the equator, the satellite will hang in the sky over a fixed location in a geostationary orbit. As predicted in the 1940s by futurist Arthur C. Clarke, geostationary orbits are in common use for communication and weather satellites, a scenario now well-known to astroimagers. Deep images of the night sky made with telescopes that follow the stars can also pick up geostationary satellites glinting in sunlight still shining far above the Earth's surface. Because they all move with the Earth's rotation against the background of stars, the satellites leave trails that seem to follow a highway across the celestial landscape. The phenomenon was captured last month in this video showing several satellites in geostationary orbit crossing the famous Orion Nebula. Tomorrow's picture: moon plane 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 |
#3726
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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. 17 January 2017 Fly Me to the Moon Image Credit & Copyright: Tamas Ladanyi (TWAN) Explanation: No, this is not a good way to get to the Moon. What is pictured is a chance superposition of an airplane and the Moon. The contrail would normally appear white, but the large volume of air toward the setting Sun preferentially knocks away blue light, giving the reflected trail a bright red hue. Far in the distance, to the right of the plane, is the young Moon. This vast world shows only a sliver of itself because the Sun is nearly lined up behind it. Captured two weeks ago, the featured image was framed by an eerie maroon sky, too far from day to be blue, too far from night to be black. Within minutes the impromptu sky show ended. The plane crossed the Moon. The contrail dispersed. The Sun set. The Moon set. The sky faded to black, only to reveal thousands of stars that had been too faint to see through the rustic red din. Tomorrow's picture: station lights 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 |
Οι παρακάτω χρήστες έχουν πει 'Ευχαριστώ' στον/στην pazo για αυτό το μήνυμα: | ||
Oasis (17-01-17) |
#3727
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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. 18 January 2017 Space Station Vista: Planet and Galaxy Image Credit: NASA, JSC, ESRS Explanation: If you could circle the Earth aboard the International Space Station, what might you see? Some amazing vistas, one of which was captured in this breathtaking picture in mid-2015. First, visible at the top, are parts of the space station itself including solar panels. Just below the station is the band of our Milky Way Galaxy, glowing with the combined light of billions of stars, but dimmed in patches by filaments of dark dust. The band of red light just below the Milky Way is airglow -- Earth's atmosphere excited by the Sun and glowing in specific colors of light. Green airglow is visible below the red. Of course that's our Earth below its air, with the terminator between day and night visible near the horizon. As clouds speckle the planet, illumination from a bright lightning bolt is seen toward the lower right. Between work assignments, astronauts from all over the Earth have been enjoying vistas like this from the space station since the year 2000. Tomorrow's picture: open space 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 |
#3728
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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. 19 January 2017 The Elephant's Trunk Nebula in Cepheus Image Credit & Copyright: Stephen Leshin Explanation: Like an illustration in a galactic Just So Story, the Elephant's Trunk Nebula winds through the emission nebula and young star cluster complex IC 1396, in the high and far off constellation of Cepheus. Also known as vdB 142, the cosmic elephant's trunk is over 20 light-years long. This colorful close-up view includes image data from a narrow band filter that transmits the light from ionized hydrogen atoms in the region. The resulting composite highlights the bright swept-back ridges that outline pockets of cool interstellar dust and gas. Such embedded, dark, tendril-shaped clouds contain the raw material for star formation and hide protostars within. Nearly 3,000 light-years distant, the relatively faint IC 1396 complex covers a large region on the sky, spanning over 5 degrees. This dramatic scene spans a 1 degree wide field, about the size of 2 Full Moons. Tomorrow's picture: pixels in space 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 |
#3729
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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. 20 January 2017 Layer Cake Sunset Image Credit & Copyright: Yuri Beletsky (Carnegie Las Campanas Observatory, TWAN) Explanation: On January 18 a tantalizing sunset was captured in this snapshot. Seemingly sliced into many horizontal layers the Sun shimmered moments before it touched the horizon, setting over the Pacific Ocean as seen from the mountaintop Las Campanas Observatory in Chile. Pink hues of filtered sunlight were created by the long sight-line through the hazy atmosphere. But the remarkable layers correspond to low atmospheric layers of sharply different temperature and density also along the line of sight. Over a long path through each layer the rays of sunlight are refracted strongly and create different images or mirages of sections of the setting Sun. Tomorrow's picture: making waves 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 |
Οι παρακάτω χρήστες έχουν πει 'Ευχαριστώ' στον/στην pazo για αυτό το μήνυμα: | ||
Easty (20-01-17) |
#3730
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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. 21 January 2017 Daphnis the Wavemaker Image Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA Explanation: Plunging close to the outer edges of Saturn's rings, on January 16 the Cassini spacecraft captured this closest yet view of Daphnis. About 8 kilometers across and orbiting within the bright ring system's Keeler gap, the small moon is making waves. The 42-kilometer wide outer gap is foreshortened in the image by Cassini's viewing angle. Raised by the influenced of the small moon's weak gravity as it crosses the frame from left to right, the waves are formed in the ring material at the edge of the gap. A faint wave-like trace of ring material is just visible trailing close behind Daphnis. Remarkable details on Daphnis can also be seen, including a narrow ridge around its equator, likely an accumulation of particles from the ring. Tomorrow's picture: space falcon 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 |
#3731
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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. 22 January 2017 SpaceX Falcon 9 to Orbit Image Credit & Copyright: Tim Shortt, Florida Today Explanation: Birds don't fly this high. Airplanes don't go this fast. The Statue of Liberty weighs less. No species other than human can even comprehend what is going on, nor could any human just a millennium ago. The launch of a rocket bound for space is an event that inspires awe and challenges description. Pictured here, a SpaceX Falcon 9 V rocket lifted off through a cloud deck from Cape Canaveral, Florida last July to deliver cargo and supplies to the International Space Station. From a standing start, the 300,000+ kilogram rocket ship lifted its Dragon Capsule up to circle the Earth, where the outside air is too thin to breathe. Rockets bound for space are now launched from somewhere on Earth about once a week. Tomorrow's picture: winter hexagon 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 Τελευταία επεξεργασία από το χρήστη pazo : 27-01-17 στις 08:55 |
Οι παρακάτω χρήστες έχουν πει 'Ευχαριστώ' στον/στην pazo για αυτό το μήνυμα: | ||
Oasis (22-01-17) |
#3732
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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 January 2017 Winter Hexagon over Manla Reservoir Image Credit & Copyright: Jeff Dai (TWAN) Explanation: If you can find Orion, you might be able to find the Winter Hexagon. The Winter Hexagon involves some of the brightest stars visible, together forming a large and easily found pattern in the winter sky of Earth's northern hemisphere. The stars involved can usually be identified even in the bright night skies of a big city, although here they appeared recently in dark skies above the Manla Reservoir in Tibet, China. The six stars that compose the Winter Hexagon are Aldebaran, Capella, Castor (and Pollux), Procyon, Rigel, and Sirius. Here, the band of our Milky Way Galaxy runs through the center of the Winter Hexagon, while the Pleiades open star cluster is visible just above. The Winter Hexagon asterism engulfs several constellations including much of the iconic steppingstone Orion. Tomorrow's picture: big blue dust 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 |
#3733
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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 January 2017 M78 and Orion Dust Reflections Image Credit & Copyright: Marco Burali, Tiziano Capecchi, Marco Mancini (MTM observatory, Italy) Explanation: In the vast Orion Molecular Cloud complex, several bright blue nebulas are particularly apparent. Pictured here are two of the most prominent reflection nebulas - dust clouds lit by the reflecting light of bright embedded stars. The more famous nebula is M78, in the image center, cataloged over 200 years ago. To its left is the lesser known NGC 2071. Astronomers continue to study these reflection nebulas to better understand how interior stars form. The Orion complex lies about 1500 light-years distant, contains the Orion and Horsehead nebulas, and covers much of the constellation of Orion. Tomorrow's picture: cassini finale 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 |
#3734
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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 January 2017 Cassini's Grand Finale Tour at Saturn Image Credit: NASA, JPL-Caltech Explanation: Cassini is being prepared to dive into Saturn. The robotic spacecraft that has been orbiting and exploring Saturn for over a decade will end its mission in September with a spectacular atmospheric plunge. Pictured here is a diagram of Cassini's remaining orbits, each taking about one week. Cassini is scheduled to complete a few months of orbits that will take it just outside Saturn's outermost ring F. Then, in April, Titan will give Cassini a gravitational pull into Proximal orbits, the last of which, on September 15, will impact Saturn and cause the spacecraft to implode and melt. Cassini's Grand Finale orbits are designed to record data and first-ever views from inside the rings -- between the rings and planet -- as well as some small moons interspersed in the rings. Cassini's demise is designed to protect any life that may occur around Saturn or its moons from contamination by Cassini itself. Tomorrow's picture: our fair planet 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 |
#3735
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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 January 2017 GOES-16: Moon over Planet Earth Image Credit: NOAA, NASA Explanation: Launched last November 19 from Cape Canaveral Air Force Station, the satellite now known as GOES-16 can now observe planet Earth from a geostationary orbit 22,300 miles above the equator. Its Advanced Baseline Imager captured this contrasting view of Earth and a gibbous Moon on January 15. The stark and airless Moon is not really the focus of GOES-16, though. Capable of providing a high resolution full disk image of Earth every 15 minutes in 16 spectral channels, the new generation satellite's instrumentation is geared to provide sharper, more detailed views of Earth's dynamic weather systems and enable more accurate weather forecasting. Like previous GOES weather satellites, GOES-16 will use the moon over our fair planet as a calibration target. Tomorrow's picture: Venus on the dew drop 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 |
Οι παρακάτω χρήστες έχουν πει 'Ευχαριστώ' στον/στην pazo για αυτό το μήνυμα: | ||
Oasis (26-01-17) |
Συνδεδεμένοι χρήστες που διαβάζουν αυτό το θέμα: 23 (0 μέλη και 23 επισκέπτες) | |
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