Acrobase  

Καλώς ήρθατε στην AcroBase.
Δείτε εδώ τα πιο πρόσφατα μηνύματα από όλες τις περιοχές συζητήσεων, καθώς και όλες τις υπηρεσίες της AcroBase.
H εγγραφή σας είναι γρήγορη και εύκολη.

Επιστροφή   Acrobase > Ελεύθερος Χρόνος και Ψυχαγωγία > Καθημερινά ενημερωτικά θέματα
Ομάδες (Groups) Τοίχος Άρθρα acrobase.org Ημερολόγιο Φωτογραφίες Στατιστικά

Notices

Δεν έχετε δημιουργήσει όνομα χρήστη στην Acrobase.
Μπορείτε να το δημιουργήσετε εδώ

Απάντηση στο θέμα
 
Εργαλεία Θεμάτων Τρόποι εμφάνισης
  #3691  
Παλιά 04-12-16, 10:06
Το avatar του χρήστη pazo
pazo Ο χρήστης pazo δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: Σήμερα 10:04
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.

4 December 2016



Orion and Official Star Names

Image Credit & Copyright: Rogelio Bernal Andreo

Explanation: Familiar stars in Orion and constellations across the sky now have official names. Over the past year, the International Astronomical Union, the only body officially tasked with naming stars, approved names already in common use for 227 of the brightest stars, including the most famous stars on the sky Sirius, Polaris, and Betelgeuse. Pictured, the constellation of Orion is shown with several of these now-official star names superposed. Spanning about 30 degrees, this breath-taking vista stretches across the well-known constellation from head to toe (left to right) and beyond. The common names for all three stars in Orion's belt are also now official. At 1,500 light years away, the Great Orion Nebula is the closest large star forming region, here visible just right and below center. Also visible are famous nebulae including the Horsehead Nebula and the Witch Head Nebula. Of course, the Orion Nebula and bright stars are easy to see with the unaided eye, but dust clouds and emission from the extensive interstellar gas in this nebula-rich complex, are too faint and much harder to record. In the featured mosaic of broadband telescopic images, additional image data acquired with a narrow hydrogen alpha filter was used to bring out the pervasive tendrils of energized atomic hydrogen gas like in the arc of the giant Barnard's Loop.

Tomorrow's picture: lightning cloud

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
__________________
VmF Skisters of Mercy ©
An eye for an eye, will make us all blind... Mahatma Ghandi
Απάντηση με παράθεση
  #3692  
Παλιά 05-12-16, 10:10
Το avatar του χρήστη pazo
pazo Ο χρήστης pazo δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: Σήμερα 10:04
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.

5 December 2016



Lightning over Colorado

Image Credit & Copyright: Joe Randall

Explanation: Have you ever watched a lightning storm in awe? Join the crowd. Oddly, nobody knows exactly how lightning is produced. What is known is that charges slowly separate in some clouds causing rapid electrical discharges (lightning), but how electrical charges get separated in clouds remains a topic of much research. Lightning usually takes a jagged course, rapidly heating a thin column of air to about three times the surface temperature of the Sun. The resulting shock wave starts supersonically and decays into the loud sound known as thunder. Lightning bolts are common in clouds during rainstorms, and on average 44 lightning bolts occur on the Earth every second. Pictured, over 60 images were stacked to capture the flow of lightning-producing storm clouds in July over Colorado Springs, Colorado, USA.

Tomorrow's picture: Juno Jupiter

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
__________________
VmF Skisters of Mercy ©
An eye for an eye, will make us all blind... Mahatma Ghandi
Απάντηση με παράθεση
  #3693  
Παλιά 06-12-16, 09:53
Το avatar του χρήστη pazo
pazo Ο χρήστης pazo δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: Σήμερα 10:04
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.

6 December 2016



Aurora over Jupiter's South Pole from Juno

Image Credit: NASA, JPL-Caltech, SwRI, ASI, INAF, JIRAM

Explanation: Why is there a glowing oval over Jupiter's South Pole? Aurora. Near the closest part of its first pass near Jupiter in August, NASA's robotic spacecraft Juno captured this dramatic infrared image of a bright auroral ring. Auroras are caused by high energy particles from the Sun interacting with a planet's magnetic field, and ovals around magnetic poles are common. Data from Juno are giving preliminary indications that Jupiter's magnetic field and aurorae are unexpectedly powerful and complex. Unfortunately, a computer glitch caused Juno to go into safe mode during its last pass near the Jovian giant in September. That glitch has now been resolved, making Juno ready for its next pass over Jupiter's cloud tops this coming Sunday.

Tomorrow's picture: galactic tentacles

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
__________________
VmF Skisters of Mercy ©
An eye for an eye, will make us all blind... Mahatma Ghandi
Απάντηση με παράθεση
  #3694  
Παλιά 08-12-16, 10:14
Το avatar του χρήστη pazo
pazo Ο χρήστης pazo δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: Σήμερα 10:04
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.

8 December 2016



Whirlpool with Comets

Image Credit & Copyright: José J. Chambó (Cometografia)

Explanation: Not a comet, bright spiral galaxy Messier 51 is popularly known as the Whirlpool Galaxy. Just off the handle of the Big Dipper in northern skies, you can spot it at the upper left in this image from December 1st. The pretty 4 by 2.5 degree wide field of view does contain two comets though. Different in appearance, both comets are new visitors to the inner Solar System and are currently faint telescopic objects, highest above northern horizons in morning twilight. At lower left newly discovered comet NEOWISE (C/2016 U1) shows off a round fuzzy coma in the greenish light of diatomic carbon gas fluorescing in sunlight. Sunlight reflects from dust in the coma and stubby tail of comet Johnson (C/2015 V2) at upper right.

Tomorrow's picture: pixels in space

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
__________________
VmF Skisters of Mercy ©
An eye for an eye, will make us all blind... Mahatma Ghandi
Απάντηση με παράθεση
  #3695  
Παλιά 09-12-16, 09:50
Το avatar του χρήστη pazo
pazo Ο χρήστης pazo δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: Σήμερα 10:04
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.

9 December 2016



IC 4628: The Prawn Nebula

Image Credit & Copyright: Data - ESO/INAF/R. Colombari/E. Recurt, Processing - R. Colombari

Explanation: South of Antares, in the tail of the nebula-rich constellation Scorpius, lies emission nebula IC 4628. Nearby hot, massive stars, millions of years young, irradiate the nebula with invisible ultraviolet light, stripping electrons from atoms. The electrons eventually recombine with the atoms to produce the visible nebular glow, dominated by the red emission of hydrogen. At an estimated distance of 6,000 light-years, the region shown is about 250 light-years across, spanning over three full moons on the sky. The nebula is also cataloged as Gum 56 for Australian astronomer Colin Stanley Gum, but seafood-loving astronomers might know this cosmic cloud as the Prawn Nebula. The tantalizing color image is a new astronomical composition using data from the European Southern Observatory's wide field OmegCAM and amateur images made under dark skies on the Canary Island of Tenerife.

Remembering John Glenn

Tomorrow's picture: light-weekend

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
__________________
VmF Skisters of Mercy ©
An eye for an eye, will make us all blind... Mahatma Ghandi

Τελευταία επεξεργασία από το χρήστη pazo : 10-12-16 στις 10:24
Απάντηση με παράθεση
  #3696  
Παλιά 10-12-16, 10:24
Το avatar του χρήστη pazo
pazo Ο χρήστης pazo δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: Σήμερα 10:04
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.

10 December 2016



The Lunar X

Image Credit & Copyright: Alessandro Marchini (Astronomical Observatory, DSFTA - Univ. of Siena),
Liceo "Alessandro Volta" Student Astronomers

Explanation: The striking X appearing in this lunarscape is easily visible in binoculars or a small telescope. Yet, not too many have seen it. The catch is this lunar X is fleeting, only apparent in the hours before the Moon's first quarter phase. At the terminator, or shadow line between lunar day and night, the X illusion is produced by a configuration of the craters Blanchinus, La Caille and Purbach. Near the Moon's first quarter phase, an astronaut standing close to the craters' position would see the slowly rising Sun very near the horizon. Temporarily, the crater walls would be in sunlight while the crater floors were still in darkness. Seen from planet Earth, contrasting sections of bright walls against the dark floors by chance look remarkably like an X. This sharp image of the Lunar X was captured at approximately 16:45 UT on December 6, 2016. For extra credit, sweep your gaze along the lunar terminator and you can also spot the Lunar V.

Tomorrow's picture: star spiral

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
__________________
VmF Skisters of Mercy ©
An eye for an eye, will make us all blind... Mahatma Ghandi
Απάντηση με παράθεση
  #3697  
Παλιά 11-12-16, 09:57
Το avatar του χρήστη pazo
pazo Ο χρήστης pazo δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: Σήμερα 10:04
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.

11 December 2016



The Extraordinary Spiral in LL Pegasi

Image Credit: ESA, Hubble, R. Sahai (JPL), NASA

Explanation: What created the strange spiral structure on the left? No one is sure, although it is likely related to a star in a binary star system entering the planetary nebula phase, when its outer atmosphere is ejected. The huge spiral spans about a third of a light year across and, winding four or five complete turns, has a regularity that is without precedent. Given the expansion rate of the spiral gas, a new layer must appear about every 800 years, a close match to the time it takes for the two stars to orbit each other. The star system that created it is most commonly known as LL Pegasi, but also AFGL 3068. The unusual structure itself has been cataloged as IRAS 23166+1655. The featured image was taken in near-infrared light by the Hubble Space Telescope. Why the spiral glows is itself a mystery, with a leading hypothesis being illumination by light reflected from nearby stars.

Tomorrow's picture: turbulent saturn

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
__________________
VmF Skisters of Mercy ©
An eye for an eye, will make us all blind... Mahatma Ghandi
Απάντηση με παράθεση
  #3698  
Παλιά 12-12-16, 09:46
Το avatar του χρήστη pazo
pazo Ο χρήστης pazo δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: Σήμερα 10:04
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.

12 December 2016



Over Saturn's Turbulent North Pole

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

Explanation: The Cassini spacecraft's Grand Finale at Saturn has begun. The Grand Finale will allow Cassini to explore Saturn and some of Saturn's moons and rings in unprecedented detail. The first phase started two weeks ago when a close flyby of Titan changed Cassini's orbit into one that passes near Saturn's poles and just outside of Saturn's outermost F-ring. Featured here is an image taken during the first of Cassini's 20 week-long F-ring orbits around Saturn. Visible are the central polar vortex on the upper left, a hexagonal cloud boundary through the image center, and numerous light-colored turbulent storm systems. In 2017 April, Cassini will again use the gravity of Titan to begin a new series of 22 Proximal orbits -- trajectories that will take Cassini inside of Saturn's rings for the first time. Cassini's new science adventure is scheduled to end on 2017 September 17, though, when the robotic spacecraft will be directed into a dramatic mission-ending dive into Saturn's atmosphere.

Tomorrow's picture: perseid mountain

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
__________________
VmF Skisters of Mercy ©
An eye for an eye, will make us all blind... Mahatma Ghandi
Απάντηση με παράθεση
  #3699  
Παλιά 13-12-16, 10:20
Το avatar του χρήστη pazo
pazo Ο χρήστης pazo δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: Σήμερα 10:04
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.

13 December 2016



Meteors over Four Girls Mountain

Image Credit & Copyright: Alvin Wu

Explanation: On some nights it rains meteors. Peaking over the next two nights, asteroid dust is expected to rain down on Earth during the annual Geminids meteor shower. This year, unfortunately, fainter Geminids will be harder to see because of the brightness of the Long Nights Full Moon, which occurs Wednesday. Pictured, an image from this year's Perseids meteor shower in August captured multiple streaks over Four Girls Mountain in central China. The bright Pleaides open star cluster appears toward the upper right, while numerous emission nebulas are visible in red, many superposed on the diagonal band of the Milky Way.

Tomorrow's picture: red lagoon

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
__________________
VmF Skisters of Mercy ©
An eye for an eye, will make us all blind... Mahatma Ghandi
Απάντηση με παράθεση
  #3700  
Παλιά 14-12-16, 12:04
Το avatar του χρήστη pazo
pazo Ο χρήστης pazo δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: Σήμερα 10:04
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.

14 December 2016



The Lagoon Nebula in High Definition

Image Credit & Copyright: Data - ESO/INAF/R. Colombari/E. Recurt; Assembling & Processing: R. Colombari

Explanation: Stars are battling gas and dust in the Lagoon Nebula but the photographers are winning. Also known as M8, this photogenic nebula is visible even without binoculars towards the constellation of Sagittarius. The energetic processes of star formation create not only the colors but the chaos. The red-glowing gas results from high-energy starlight striking interstellar hydrogen gas. The dark dust filaments that lace M8 were created in the atmospheres of cool giant stars and in the debris from supernovae explosions. The light from M8 we see today left about 5,000 years ago. Light takes about 50 years to cross this section of M8. Data used to compose this image was taken with the wide-field camera OmegaCam of the ESO's VLT Survey Telescope (VST).

Tomorrow's picture: open space

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
__________________
VmF Skisters of Mercy ©
An eye for an eye, will make us all blind... Mahatma Ghandi
Απάντηση με παράθεση
Οι παρακάτω χρήστες έχουν πει 'Ευχαριστώ' στον/στην pazo για αυτό το μήνυμα:
Naias (14-12-16)
  #3701  
Παλιά 16-12-16, 09:45
Το avatar του χρήστη pazo
pazo Ο χρήστης pazo δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: Σήμερα 10:04
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.

16 December 2016



Meteors vs Supermoon

Image Credit & Copyright: Wang, Letian

Explanation: Geminid meteors battled supermoonlight in planet Earth's night skies on December 13/14. Traveling at 35 kilometers (22 miles) per second, the bits of dust from the mysterious asteroid 3200 Phaethon that produce the meteor streaks are faster than a speeding bullet. Still, only the brightest were visible during the long night of 2016's final Perigee Full Moon. Captured in exposures made over several hours, a few meteors from the shower's radiant in Gemini can be traced through this composite nightscape. With stars of Orion near the horizon, the overexposed lunar disk illuminates still waters of the Miyun reservoir northeast of Beijing, China.

Tomorrow's picture: by Jove

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
__________________
VmF Skisters of Mercy ©
An eye for an eye, will make us all blind... Mahatma Ghandi
Απάντηση με παράθεση
  #3702  
Παλιά 17-12-16, 10:14
Το avatar του χρήστη pazo
pazo Ο χρήστης pazo δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: Σήμερα 10:04
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.

17 December 2016



Southern Jupiter from Perijove 3

Image Credit: NASA, JPL-Caltech, SwRI, MSSS; Processing: Damian Peach

Explanation: Southern Jupiter looms some 37,000 kilometers away in this JunoCam image from December 11. The image data was captured near Juno's third perijove or closest approach to Jupiter, the spacecraft still in its 53 day long looping orbit. With the south polar region on the left, the large whitish oval toward the right is massive, counterclockwise rotating storm system. Smaller than the more famous Great Red Spot, the oval storm is only about half the diameter of planet Earth, one of a string of white ovals currently in the southern hemisphere of the Solar System's, ruling gas giant.

Tomorrow's picture: big wheel

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
__________________
VmF Skisters of Mercy ©
An eye for an eye, will make us all blind... Mahatma Ghandi
Απάντηση με παράθεση
  #3703  
Παλιά 18-12-16, 11:04
Το avatar του χρήστη pazo
pazo Ο χρήστης pazo δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: Σήμερα 10:04
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.

18 December 2016



The Cartwheel Galaxy from Hubble

Image Credit: ESA, NASA, Hubble

Explanation: To some, it looks like the wheel of a cart. In fact, because of its outward oval appearance, the presence of a central galaxy, and their connection with what looks like the spokes of a wheel, the galaxy on the right is known as the Cartwheel Galaxy. To others, however, it looks like a complicated interaction between galaxies awaiting explanation. Along with the two galaxies on the left, the Cartwheel is part of a group of galaxies about 400 million light years away in the constellation Sculptor. The large galaxy's rim spans over 100,000 light years and is composed of star forming regions filled with extremely bright and massive stars. Pictured, the Cartwheel's ring-like shape is the result of gravitational disruption caused by a smaller galaxy passing through a large one, compressing the interstellar gas and dust and causing a star formation wave to move out like a ripple across the surface of a pond.

Tomorrow's picture: supermoon castle

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
__________________
VmF Skisters of Mercy ©
An eye for an eye, will make us all blind... Mahatma Ghandi
Απάντηση με παράθεση
  #3704  
Παλιά 19-12-16, 10:14
Το avatar του χρήστη pazo
pazo Ο χρήστης pazo δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: Σήμερα 10:04
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.

19 December 2016



Supermoon over Spanish Castle

Image Credit & Copyright: Tomeu Mas

Explanation: No, this castle was not built with the Moon attached. To create the spectacular juxtaposition, careful planning and a bit of good weather was needed. Pictured, the last supermoon of 2016 was captured last week rising directly beyond one of the towers of Bellver Castle in Palma de Mallorca on the Balearic Islands of Spain. The supermoon was the last full moon of 2016 and known to some as the Oak Moon. Bellver Castle was built in the early 1300s and has served as a home -- but occasional as a prison -- to numerous kings and queens. The Moon was built about 4.5 billion years ago, possibly resulting from a great collision with a Mars-sized celestial body and Earth. The next supermoon, defined as when the moon appears slightly larger and brighter than usual, will occur on 2017 December 3 and be visible not only behind castles but all over the Earth.

Tomorrow's picture: big bubble

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
__________________
VmF Skisters of Mercy ©
An eye for an eye, will make us all blind... Mahatma Ghandi
Απάντηση με παράθεση
  #3705  
Παλιά 20-12-16, 10:16
Το avatar του χρήστη pazo
pazo Ο χρήστης pazo δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: Σήμερα 10:04
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.

20 December 2016



Sharpless 308: Star Bubble

Image Credit & Copyright: Anis Abdul

Explanation: Blown by fast winds from a hot, massive star, this cosmic bubble is huge. Cataloged as Sharpless 2-308 it lies some 5,200 light-years away toward the constellation of the Big Dog (Canis Major) and covers slightly more of the sky than a full moon. That corresponds to a diameter of 60 light-years at its estimated distance. The massive star that created the bubble, a Wolf-Rayet star, is the bright one near the center of the nebula. Wolf-Rayet stars have over 20 times the mass of the Sun and are thought to be in a brief, pre-supernova phase of massive star evolution. Fast winds from this Wolf-Rayet star create the bubble-shaped nebula as they sweep up slower moving material from an earlier phase of evolution. The windblown nebula has an age of about 70,000 years. Relatively faint emission captured in the expansive image is dominated by the glow of ionized oxygen atoms mapped to a blue hue.

Tomorrow's picture: plane glory

ΠΗΓΗ: http://apod.nasa.gov/apod/astropix.html
__________________
VmF Skisters of Mercy ©
An eye for an eye, will make us all blind... Mahatma Ghandi
Απάντηση με παράθεση
Απάντηση στο θέμα


Συνδεδεμένοι χρήστες που διαβάζουν αυτό το θέμα: 4 (0 μέλη και 4 επισκέπτες)
 
Εργαλεία Θεμάτων
Τρόποι εμφάνισης

Δικαιώματα - Επιλογές
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is σε λειτουργία
Τα Smilies είναι σε λειτουργία
Ο κώδικας [IMG] είναι σε λειτουργία
Ο κώδικας HTML είναι σε λειτουργία

Που θέλετε να σας πάμε;


Όλες οι ώρες είναι GMT +3. Η ώρα τώρα είναι 13:08.



Forum engine powered by : vBulletin Version 3.8.2
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.