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
  #3001  
Παλιά 28-12-14, 12:14
Το avatar του χρήστη Xenios
Xenios Ο χρήστης Xenios δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: 12-11-16 11:12
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.
2014 December 28

Unusual Light Pillars over Latvia
Image Credit & Copyright: Aigar Truhin
Explanation: What's happening over that town? Close inspection shows these strange columns of light occur over bright lights, and so likely are light pillars that involve falling ice crystals reflecting back these lights. The above image and several similar images were taken with a standard digital camera in Sigulda, Latvia in late 2009. The reason why these pillars fan out at the top, however, remains a topic for speculation. The air was noted to be quite cold and indeed filled with small ice crystals, just the type known to create several awe-inspiring but well known sky phenomena such as light pillars, sun pillars, sun dogs, and moon halos. The cold and snowy winter occurring this year in parts of Earth's northern hemisphere is giving sky enthusiasts new and typically unexpected opportunities to see several of these unusual optical atmospheric phenomena for themselves.
Tomorrow's picture: open space

Πηγή
__________________
όταν γράφεται η ιστορία της ζωής σου,
μην αφήνεις κανέναν να κρατάει την πένα
Απάντηση με παράθεση
  #3002  
Παλιά 30-12-14, 11:51
Το avatar του χρήστη Xenios
Xenios Ο χρήστης Xenios δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: 12-11-16 11:12
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.
2014 December 30

Observatory, Mountains, Universe
Image Credit & Copyright: Boris Dmitriev (Night Scape)
Explanation: The awesomeness in this image comes in layers. The closest layer, in the foreground, contains the Peak Terskol Observatory located in the northern Caucasus Mountains of Russia. The white dome over the 2-meter telescope is clearly visible. The observatory is located on a shoulder of Mt. Elbrus, the highest mountain in Europe, with other peaks visible in a nearby background layer. Clouds are visible both in front of and behind the mountain peaks. The featured three-image composite panorama was taken in 2014 August. Far in the distance is the most distant layer: the stars and nebulas of the night sky, with the central band of the Milky Way rising on the image right.
Tomorrow's picture: fox vs. unicorn

Πηγή
__________________
όταν γράφεται η ιστορία της ζωής σου,
μην αφήνεις κανέναν να κρατάει την πένα
Απάντηση με παράθεση
  #3003  
Παλιά 31-12-14, 12:06
Το avatar του χρήστη Xenios
Xenios Ο χρήστης Xenios δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: 12-11-16 11:12
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.
2014 December 31

Comet Lovejoy before a Globular Star Cluster
Image Credit & Copyright: Dieter Willasch (Astro-Cabinet)
Explanation: Comet Lovejoy has become visible to the unaided eye. To see the comet, just go outside an hour or so after sunset and look for a fuzzy patch to the right of Orion's belt. Binoculars and a star chart may help. Pictured here, Comet C/2014 Q2 (Lovejoy) was captured three days ago passing nearly in front of M79, the globular star cluster visible as the bright spot slightly above and to the left of the comet's green-hued coma. The nucleus of Comet Lovejoy is a giant dirty iceberg that is shedding gas into a long and intricate ion tail, extending across the image, as it nears the Sun. The comet is expected to become even easier to spot for northern observers during January, as it is rises earlier and, hopefully, continues to brighten.
Tomorrow's picture: cosmic fireworks

Πηγή
__________________
όταν γράφεται η ιστορία της ζωής σου,
μην αφήνεις κανέναν να κρατάει την πένα
Απάντηση με παράθεση
  #3004  
Παλιά 01-01-15, 10:18
Το avatar του χρήστη Xenios
Xenios Ο χρήστης Xenios δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: 12-11-16 11:12
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.
2015 January 1

Vela Supernova Remnant
Image Credit & Copyright: CEDIC Team - Processing: Wolfgang Leitner
Explanation: The plane of our Milky Way Galaxy runs through this complex and beautiful skyscape. At the northwestern edge of the constellation Vela (the Sails) the telescopic frame is over 10 degrees wide, centered on the brightest glowing filaments of the Vela Supernova Remnant, an expanding debris cloud from the death explosion of a massive star. Light from the supernova explosion that created the Vela remnant reached Earth about 11,000 years ago. In addition to the shocked filaments of glowing gas, the cosmic catastrophe also left behind an incredibly dense, rotating stellar core, the Vela Pulsar. Some 800 light-years distant, the Vela remnant is likely embedded in a larger and older supernova remnant, the Gum Nebula
Tomorrow's picture: Trapezium

Πηγή
__________________
όταν γράφεται η ιστορία της ζωής σου,
μην αφήνεις κανέναν να κρατάει την πένα
Απάντηση με παράθεση
  #3005  
Παλιά 02-01-15, 10:26
Το avatar του χρήστη Xenios
Xenios Ο χρήστης Xenios δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: 12-11-16 11:12
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.
2015 January 2

At the Heart of Orion
Image Credit & Copyright: László Francsics
Explanation: Near the center of this sharp cosmic portrait, at the heart of the Orion Nebula, are four hot, massive stars known as the Trapezium. Tightly gathered within a region about 1.5 light-years in radius, they dominate the core of the dense Orion Nebula Star Cluster. Ultraviolet ionizing radiation from the Trapezium stars, mostly from the brightest star Theta-1 Orionis C powers the complex star forming region's entire visible glow. About three million years old, the Orion Nebula Cluster was even more compact in its younger years and a dynamical study indicates that runaway stellar collisions at an earlier age may have formed a black hole with more than 100 times the mass of the Sun. The presence of a black hole within the cluster could explain the observed high velocities of the Trapezium stars. The Orion Nebula's distance of some 1,500 light-years would make it the closest known black hole to planet Earth.
Tomorrow's picture: Stereo Saturday

Πηγή
__________________
όταν γράφεται η ιστορία της ζωής σου,
μην αφήνεις κανέναν να κρατάει την πένα
Απάντηση με παράθεση
  #3006  
Παλιά 03-01-15, 11:34
Το avatar του χρήστη Xenios
Xenios Ο χρήστης Xenios δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: 12-11-16 11:12
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.
2015 January 3

Apollo 17: A Stereo View from Lunar Orbit
Image Credit: Gene Cernan, Apollo 17, NASA; Anaglyph by Patrick Vantuyne
Explanation: Get out your red/blue glasses and check out this awesome stereo view of another world. The scene was recorded by Apollo 17 mission commander Eugene Cernan on December 11, 1972, one orbit before descending to land on the Moon. The stereo anaglyph was assembled from two photographs (AS17-147-22465, AS17-147-22466) captured from his vantage point on board the Lunar Module Challenger as he and Dr. Harrison Schmitt flew over Apollo 17's landing site in the Taurus-Littrow Valley. The broad, sunlit face of the mountain dubbed South Massif rises near the center of the frame, above the dark floor of Taurus-Littrow to its left. Beyond the mountains, toward the lunar limb, lies the Moon's Mare Serenitatis. Piloted by Ron Evans, the Command Module America is visible in orbit in the foreground against the South Massif's peak.
Tomorrow's picture: ringside

Πηγή
__________________
όταν γράφεται η ιστορία της ζωής σου,
μην αφήνεις κανέναν να κρατάει την πένα
Απάντηση με παράθεση
  #3007  
Παλιά 04-01-15, 11:58
Το avatar του χρήστη Xenios
Xenios Ο χρήστης Xenios δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: 12-11-16 11:12
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.
2015 January 4

Crescent Rhea Occults Crescent Saturn
Image Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA
Explanation: Soft hues, partially lit orbs, a thin trace of the ring, and slight shadows highlight this understated view of the majestic surroundings of the giant planet Saturn. Looking nearly back toward the Sun, the robot Cassini spacecraft now orbiting Saturn captured crescent phases of Saturn and its moon Rhea in color a few years ago. As striking as the above image is, it is but a single frame from a 60-frame silent movie where Rhea can be seen gliding in front of its parent world. Since Cassini was nearly in the plane of Saturn's rings, the normally impressive rings are visible here only as a thin line across the image center.
Tomorrow's picture: fox vs. unicorn

Πηγή
__________________
όταν γράφεται η ιστορία της ζωής σου,
μην αφήνεις κανέναν να κρατάει την πένα
Απάντηση με παράθεση
  #3008  
Παλιά 07-01-15, 10:21
Το avatar του χρήστη Xenios
Xenios Ο χρήστης Xenios δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: 12-11-16 11:12
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.
2015 January 7

Hubble 25th Anniversary: Pillars of Creation
Image Credit: NASA, ESA, and The Hubble Heritage Team (STScI / AURA)
Explanation: To celebrate 25 years (1990-2015) of exploring the Universe from low Earth orbit, the Hubble Space Telescope's cameras were used to revisit its most iconic image. The result is this sharper, wider view of the region dubbed the Pillars of Creation, first imaged by Hubble in 1995. Stars are forming deep inside the towering structures. The light-years long columns of cold gas and dust are some 6,500 light-years distant in M16, the Eagle Nebula, toward the constellation Serpens. Sculpted and eroded by the energetic ultraviolet light and powerful winds from M16's cluster of young, massive stars, the cosmic pillars themselves are destined for destruction. But the turbulent environment of star formation within M16, whose spectacular details are captured in this Hubble visible-light snapshot, is likely similar to the environment that formed our own Sun.
APOD Talk:Friday, January 9 in New York City
Tomorrow's picture: across Corona Australis

Πηγή
__________________
όταν γράφεται η ιστορία της ζωής σου,
μην αφήνεις κανέναν να κρατάει την πένα
Απάντηση με παράθεση
  #3009  
Παλιά 08-01-15, 10:42
Το avatar του χρήστη Xenios
Xenios Ο χρήστης Xenios δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: 12-11-16 11:12
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.
2015 January 8

Stars and Dust in Corona Australis
Image Credit & Copyright: CHART32 Team, Processing - Johannes Schedler
Explanation: Cosmic dust clouds and young, energetic stars inhabit this telescopic vista, less than 500 light-years away toward the northern boundary of Corona Australis, the Southern Crown. The dust clouds effectively block light from more distant background stars in the Milky Way. But the striking complex of reflection nebulae cataloged as NGC 6726, 6727, and IC 4812 produce a characteristic blue color as light from the region's young hot stars is reflected by the cosmic dust. The dust also obscures from view stars still in the process of formation. At the left, smaller yellowish nebula NGC 6729 bends around young variable star R Coronae Australis. Just below it, glowing arcs and loops shocked by outflows from embedded newborn stars are identified as Herbig-Haro objects. On the sky this field of view spans about 1 degree. That corresponds to almost 9 light-years at the estimated distance of the nearby star forming region.
APOD Talk:Friday, January 9 in New York City
Tomorrow's picture: In the Arms of NGC 1097

Πηγή
__________________
όταν γράφεται η ιστορία της ζωής σου,
μην αφήνεις κανέναν να κρατάει την πένα
Απάντηση με παράθεση
  #3010  
Παλιά 10-01-15, 10:32
Το avatar του χρήστη Xenios
Xenios Ο χρήστης Xenios δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: 12-11-16 11:12
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.
2015 January 10

The Windmill's Moon
Image Credit & Copyright: Babak Tafreshi (TWAN)
Explanation: Seen from the Canary Island of Fuerteventura, this bright Full Moon rose at sunset. Reaching its full phase on the night of January 4/5, it was the first Full Moon of the new year and the first to follow December's solstice. Of course, in North America the first Full Moon of January has been known as the Wolf's Moon. But this Full Moon, posed in the twilight above an island of strong winds and traditional windmills, suggests another name. The telephoto image, taken at a distance from the foreground windmill, creates the dramatic comparison in apparent size for windmill and Full Moon.
Tomorrow's picture: Cataclysmic Dawn

Πηγή
__________________
όταν γράφεται η ιστορία της ζωής σου,
μην αφήνεις κανέναν να κρατάει την πένα
Απάντηση με παράθεση
  #3011  
Παλιά 11-01-15, 10:57
Το avatar του χρήστη Xenios
Xenios Ο χρήστης Xenios δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: 12-11-16 11:12
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.
2015 January 11

Cataclysmic Dawn
Illustration Credit & Copyright: Mark A. Garlick (Space-art.co.uk)
Explanation: Will this dawn bring another nova? Such dilemmas might be pondered one day by future humans living on a planet orbiting a cataclysmic variable binary star system. Cataclysmic variables involve gas falling from a large star onto an accretion disk surrounding a massive but compact white dwarf star. Explosive cataclysmic events such as a dwarf nova can occur when a clump of gas in the interior of the accretion disk heats up past a certain temperature. At that point, the clump will fall more quickly onto the white dwarf and land with a bright flash. Such dwarf novas will not destroy either star, and may occur irregularly on time scales from a few days to tens of years. Although a nova is much less energetic than a supernova, if recurrent novas are not violent enough to expel more gas than is falling in, mass will accumulate onto the white dwarf star until it passes its Chandrasekhar limit. At that point, a foreground cave may provide little protection, as the entire white dwarf star will explode in a tremendous supernova.
Tomorrow's picture: crash planets

Πηγή
__________________
όταν γράφεται η ιστορία της ζωής σου,
μην αφήνεις κανέναν να κρατάει την πένα
Απάντηση με παράθεση
  #3012  
Παλιά 13-01-15, 10:55
Το avatar του χρήστη Xenios
Xenios Ο χρήστης Xenios δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: 12-11-16 11:12
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.
2015 January 13

The Soap Bubble Nebula
Credit & Copyright: T. Rector (U. Alaska Anchorage), H. Schweiker (WIYN), NOAO, AURA, NSF
Explanation: Adrift in the rich star fields of the constellation Cygnus, this lovely, symmetric nebula was only recognized a few years ago and does not yet appear in some astronomical catalogs. In fact, amateur astronomer Dave Jurasevich identified it as a nebula on 2008 July 6 in his images of the complex Cygnus region that included the Crescent Nebula (NGC 6888). He subsequently notified the International Astronomical Union. Only eleven days later the same object was independently identified by Mel Helm at Sierra Remote Observatories, imaged by Keith Quattrocchi and Helm, and also submitted to the IAU as a potentially unknown nebula. The nebula, appearing on the left of the featured image, is now known as the Soap Bubble Nebula. What is the newly recognized nebula? Most probably it is a planetary nebula, a final phase in the life of a sun-like star.
Tomorrow's picture: pixels in space

Πηγή
__________________
όταν γράφεται η ιστορία της ζωής σου,
μην αφήνεις κανέναν να κρατάει την πένα
Απάντηση με παράθεση
  #3013  
Παλιά 14-01-15, 10:58
Το avatar του χρήστη Xenios
Xenios Ο χρήστης Xenios δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: 12-11-16 11:12
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.
2015 January 14

The Hunter, the Bull, and Lovejoy
Image Credit & Copyright: Mike Cavaroc
Explanation: Heading north, Comet Lovejoy (C/2014 Q2) is putting on its best show for comet watchers now, with moonlight absent from mid-January's early evening skies. An easy binocular target and just visible to the unaided eye from dark sites, the comet sweeps across the constellation Taurus the Bull in this deep night skyscape. The starry scene was captured just two days ago on January 12, from Jackson Hole, Wyoming, planet Earth. In fact, the head of Taurus formed by the V-shaped Hyades star cluster points toward Lovejoy at the right. The comet's greenish coma and tail streaming in the anti-sunward direction also seem to have been shot from Orion's bow. You can spot the familiar stars of the nebula rich constellation of the Hunter on the left, and follow this link to highlight Comet Lovejoy in the wide field of view.
Tomorrow's picture: pixels in space

Πηγή
__________________
όταν γράφεται η ιστορία της ζωής σου,
μην αφήνεις κανέναν να κρατάει την πένα
Απάντηση με παράθεση
  #3014  
Παλιά 15-01-15, 09:54
Το avatar του χρήστη Xenios
Xenios Ο χρήστης Xenios δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: 12-11-16 11:12
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.
2015 January 15

Venus and Mercury at Sunset
Image Credit & Copyright: Tamas Ladanyi (TWAN)
Explanation: Inner planets Venus and Mercury can never wander far from the Sun in Earth's sky. This week you've probably seen them both gathered near the western horizon just after sunset, a close conjunction of bright celestial beacons in the fading twilight. The pair are framed in this early evening skyview captured on January 13 from the ruins of Szarvasko Castle in northwestern Hungary. Above the silhouette of the landscape's prominent volcanic hill Venus is much the brighter, separated from Mercury by little more than the width of two Full Moons. On Friday, planet Earth's early morning risers will also be treated to a close conjunction, when Saturn meets an old crescent Moon near the southeastern horizon at dawn.
Tomorrow's picture: a distant landing

Πηγή
__________________
όταν γράφεται η ιστορία της ζωής σου,
μην αφήνεις κανέναν να κρατάει την πένα
Απάντηση με παράθεση
  #3015  
Παλιά 16-01-15, 10:47
Το avatar του χρήστη Xenios
Xenios Ο χρήστης Xenios δεν είναι συνδεδεμένος
Administrator
 

Τελευταία φορά Online: 12-11-16 11:12
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.
2015 January 16

Huygens Lands on Titan
Image Credit: ESA / NASA / JPL / University of Arizona
Explanation: Delivered by Saturn-bound Cassini, ESA's Huygens probe touched down on the ringed planet's largest moon Titan, ten years ago on January 14, 2005. These panels show fisheye images made during its slow descent by parachute through Titan's dense atmosphere. Taken by the probe's descent imager/spectral radiometer instrument they range in altitude from 6 kilometers (upper left) to 0.2 kilometers (lower right) above the moon's surprisingly Earth-like surface of dark channels, floodplains, and bright ridges. But at temperatures near -290 degrees C, the liquids flowing across Titan's surface are methane and ethane, hydrocarbons rather than water. After making the most distant landing for a spacecraft from Earth, Huygens transmitted data for more than an hour. The Huygens data and a decade of exploration by Cassini have shown Titan to be a tantalizing world hosting a complex chemistry of organic compounds, dynamic landforms, lakes, seas, and a possible subsurface ocean of liquid water.
Tomorrow's picture: the Moon would be this big

__________________
όταν γράφεται η ιστορία της ζωής σου,
μην αφήνεις κανέναν να κρατάει την πένα
Απάντηση με παράθεση
Απάντηση στο θέμα


Συνδεδεμένοι χρήστες που διαβάζουν αυτό το θέμα: 2 (0 μέλη και 2 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 08:00.



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