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Εργαλεία Θεμάτων Αξιολόγηση: Αξιολόγηση θέματος: 91 Ψήφοι, 4,95 κατά μέσο όρο. Τρόποι εμφάνισης
  #3721  
Παλιά 11-01-17, 09:54
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Astronomy Picture of the Day

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11 January 2017



Mimas, Crater, and Mountain

Image Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA

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.

Tomorrow's picture: far, far away

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
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  #3722  
Παλιά 12-01-17, 10:23
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Astronomy Picture of the Day

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12 January 2017



Edge-On NGC 891

Image Credit & Copyright: Alessandro Falesiedi

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.

Tomorrow's picture: when Neptune met Mars

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
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  #3723  
Παλιά 13-01-17, 09:54
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Astronomy Picture of the Day

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13 January 2017



When Mars met Neptune

Image Credit & Copyright: Stephen Mudge

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.

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
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  #3724  
Παλιά 15-01-17, 11:27
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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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  #3725  
Παλιά 16-01-17, 10:29
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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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  #3726  
Παλιά 17-01-17, 09:48
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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

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  #3727  
Παλιά 18-01-17, 11:13
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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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  #3728  
Παλιά 19-01-17, 11:21
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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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  #3729  
Παλιά 20-01-17, 11:43
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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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  #3730  
Παλιά 21-01-17, 11:32
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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

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  #3731  
Παλιά 22-01-17, 11:56
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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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Τελευταία επεξεργασία από το χρήστη pazo : 27-01-17 στις 09:55
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  #3732  
Παλιά 23-01-17, 12:32
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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

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  #3733  
Παλιά 24-01-17, 10:25
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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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  #3734  
Παλιά 25-01-17, 11:00
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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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  #3735  
Παλιά 26-01-17, 10:17
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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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