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Astronomy Picture of the Day - Σελίδα 15 Icon_minitimeΔευ Μάης 21, 2018 9:24 pm από panosol

» ΚΑΛΗ ΑΝΑΣΤΑΣΗ ΚΑΙ ΚΑΛΟ ΠΑΣΧΑ!!
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» Εφυγε από τη ζωή ο Τζίμης Πανούσης
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» ΧΡΟΝΙΑ ΠΟΛΛΑ ΚΑΙ ΚΑΛΗ ΧΡΟΝΙΑ ΜΕ ΥΓΕΙΑ ΚΑΙ ΕΥΤΥΧΙΑ!!!
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Astronomy Picture of the Day - Σελίδα 15 Icon_minitimeΚυρ Δεκ 31, 2017 9:18 am από panosol

» Τις καλύτερες ευχές μου για Ευτυχισμένα Χριστούγεννα σε όλους!!
Astronomy Picture of the Day - Σελίδα 15 Icon_minitimeΔευ Δεκ 25, 2017 10:32 am από panosol

» ΖΗΤΩ Η 28η ΟΚΤΩΒΡΙΟΥ 1940
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» ΖΗΤΩ Η 28η ΟΚΤΩΒΡΙΟΥ 1940
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» Το τελευταίο αντίο στη Ζωή Λάσκαρη
Astronomy Picture of the Day - Σελίδα 15 Icon_minitimeΤρι Αυγ 22, 2017 7:20 pm από panosol

» 19 Μαΐου: Ημέρα Μνήμης της Γενοκτονίας των Ποντίων
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Astronomy Picture of the Day

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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 12

Δημοσίευση  panosol Τρι Δεκ 12, 2017 7:33 pm

2017 December 12
Astronomy Picture of the Day - Σελίδα 15 Winter1718_Highlights_Universe2go_4994

Highlights of the Winter Sky
Illustration Credit & Copyright: Universe2go.com

Explanation: What's up in the sky this winter? The featured graphic gives a few highlights for Earth's northern hemisphere. Viewed as a clock face centered at the bottom, early winter sky events fan out toward the left, while late winter events are projected toward the right. Objects relatively close to Earth are illustrated, in general, as nearer to the cartoon figure with the telescope at the bottom center -- although almost everything pictured can be seen without a telescope. Highlights of this winter's sky include the Geminids meteor shower peaking this week, the constellation of Orion becoming notable in the evening sky, and many planets being visible before sunrise in February. As true in every season, the International Space Station (ISS) can be sometimes be found drifting across your sky if you know just when and where to look.
panosol
panosol

Αριθμός μηνυμάτων : 762
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Ηλικία : 56

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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 13

Δημοσίευση  panosol Τετ Δεκ 13, 2017 7:31 pm

2017 December 13
Astronomy Picture of the Day - Σελίδα 15 Perseids_Yu_2000

Meteors over Inner Mongolia
Image Credit & Copyright: Haitong Yu

Explanation: Did you ever get caught in a meteor shower? If yes, then every minute or so the sky sparked with fleeting flashes of light. This was the fate of the pictured astrophotographer during last year's Perseids meteor shower. During the featured three-hour image composite, about 90 Perseids rained down above Lake Duolun of Inner Mongolia, China. If you trace back the meteor streaks, you will find that most of them appear to radiate from a single constellation -- in this case Perseus. In fact, you can even tell which meteors are not Perseids because they track differently. Tonight promises to be another good night to get caught in a meteor shower because it is the peak for the Geminids. Gemini, the shower radiant, should rise shortly after sunset and be visible most of the night.
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
Reputation : 15
Ημερομηνία εγγραφής : 17/06/2012
Ηλικία : 56

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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 14

Δημοσίευση  panosol Πεμ Δεκ 14, 2017 6:34 pm

2017 December 14



Jupiter Diving
Image Credit: NASA, JPL-Caltech, SwRI, MSSS, Gerald Eichstadt, Justin Cowart

Explanation: Take this simulated plunge and dive into the upper atmosphere of Jupiter, the Solar System's ruling gas giant. The awesome animation is based on image data from JunoCam, and the microwave radiometer on board the Jupiter-orbiting Juno spacecraft. You're view will start about 3,000 kilometers above the southern Jovian cloud tops, but you can track your progress on the display at the left. As altitude decreases, temperature increases while you dive deeper at the location of Jupiter's famous Great Red Spot. In fact, Juno data indicates the Great Red Spot, the Solar System's largest storm system, penetrates some 300 kilometers into the giant planet's atmosphere. For comparison, the deepest point for planet Earth's oceans is just under 11 kilometers down. Don't panic though, you'll fly back out again.
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
Reputation : 15
Ημερομηνία εγγραφής : 17/06/2012
Ηλικία : 56

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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 15

Δημοσίευση  panosol Παρ Δεκ 15, 2017 7:19 pm

2017 December 15
Astronomy Picture of the Day - Σελίδα 15 Geminids_Yin_Hao_C

Geminids of the North
Image Credit & Copyright: Yin Hao

Explanation: Earth's annual Geminid meteor shower did not disappoint as our fair planet plowed through dust from active asteroid 3200 Phaethon. Captured in this northern hemisphere nightscape, the meteors stream away from the shower's radiant in Gemini. To create the image, 37 individual frames recording meteor streaks were taken over period of 8.5 hours during the night of December 12/13. In the final composite they were selected and registered against the starry sky above a radio telescope dish of MUSER, a solar-dedicated radio telescope array at astronomically-named Mingantu Station in Inner Mongolia, China, about 400 kilometers from Beijing. Sirius, alpha star of Canis Major, shines brightly just above the radio dish and the Milky Way stretches toward the zenith. Yellowish Betelgeuse is a standout in Orion to the right of the northen Milky Way. The shower's radiant is at top left, high above the horizon near Castor and Pollux the twin stars of Gemini. The radiant effect is due to perspective as the parallel meteor tracks appear to converge in the distance. Gemini's meteors enter Earth's atmosphere traveling at about 22 kilometers per second.
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
Reputation : 15
Ημερομηνία εγγραφής : 17/06/2012
Ηλικία : 56

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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 16

Δημοσίευση  panosol Σαβ Δεκ 16, 2017 1:14 pm

2017 December 16
Astronomy Picture of the Day - Σελίδα 15 Jack_Fusco_Jasper_Geminids

A Wintry Shower
Image Credit & Copyright: Jack Fusco

Explanation: Four Geminids flash through northern skies in this wintry night skyscape. The bright fireball and 3 fainter meteors were captured in a single 10 second exposure, near the peak of December's Geminid meteor shower. Reflecting the fireball's greenish light, a partially frozen Lake Edith in Alberta Canada's Jasper National Park lies in the foreground, with the Canadian Rocky Mountains ranging along the northern horizon. Of course, the glacial lake is cold even in summer. But photographer Jack Fusco reports that he experienced -9 degree C temperatures that night while enjoying one of the most active meteor showers he's ever seen.
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
Reputation : 15
Ημερομηνία εγγραφής : 17/06/2012
Ηλικία : 56

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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 17

Δημοσίευση  panosol Κυρ Δεκ 17, 2017 10:12 am

2017 December 17
Astronomy Picture of the Day - Σελίδα 15 Qso2237_wiyn_1024

The Einstein Cross Gravitational Lens
Image Credit & Copyright: J. Rhoads (Arizona State U.) et al., WIYN, AURA, NOAO, NSF

Explanation: Most galaxies have a single nucleus -- does this galaxy have four? The strange answer leads astronomers to conclude that the nucleus of the surrounding galaxy is not even visible in this image. The central cloverleaf is rather light emitted from a background quasar. The gravitational field of the visible foreground galaxy breaks light from this distant quasar into four distinct images. The quasar must be properly aligned behind the center of a massive galaxy for a mirage like this to be evident. The general effect is known as gravitational lensing, and this specific case is known as the Einstein Cross. Stranger still, the images of the Einstein Cross vary in relative brightness, enhanced occasionally by the additional gravitational microlensing effect of specific stars in the foreground galaxy.
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
Reputation : 15
Ημερομηνία εγγραφής : 17/06/2012
Ηλικία : 56

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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 18

Δημοσίευση  panosol Δευ Δεκ 18, 2017 8:49 pm

2017 December 18
Astronomy Picture of the Day - Σελίδα 15 Kepler90_Illustration_Kepler_1820

The Kepler-90 Planetary System
Illustration Credit: NASA Ames, Wendy Stenzel

Explanation: Do other stars have planetary systems like our own? Yes -- one such system is Kepler-90. Cataloged by the orbiting Kepler satellite, an eighth planet has now been discovered giving Kepler-90 the same number of known planets as our Solar System. Similarities between Kepler-90 and our system include a G-type star comparable to our Sun, rocky planets comparable to our Earth, and large planets comparable in size to Jupiter and Saturn. Differences include that all of the known Kepler-90 planets orbit relatively close in -- closer than Earth's orbit around the Sun -- making them possibly too hot to harbor life. However, observations over longer time periods may discover cooler planets further out. Kepler-90 lies about 2,500 light years away, and at magnitude 14 is visible with a medium-sized telescope toward the constellation of the Dragon (Draco). Exoplanet-finding missions planned for launch in the next decade include TESS, JWST, WFIRST, and PLATO.
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
Reputation : 15
Ημερομηνία εγγραφής : 17/06/2012
Ηλικία : 56

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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 19

Δημοσίευση  panosol Τρι Δεκ 19, 2017 7:27 pm

2017 December 19
Astronomy Picture of the Day - Σελίδα 15 Mars_North_Pole_Mars_Express_1110

The Spiral North Pole of Mars
Image Credit: ESA/DLR/FU Berlin; NASA MGS MOLA Science Team

Explanation: Why is there a spiral around the North Pole of Mars? Each winter this pole develops a new outer layer about one meter thick composed of carbon dioxide frozen out of the thin Martian atmosphere. This fresh layer is deposited on a water-ice layer that exists year round. Strong winds blow down from above the cap's center and swirl due to the spin of the red planet -- contributing to Planum Boreum's spiral structure. The featured image is a perspective mosaic generated earlier this year from numerous images taken by ESA's Mars Express and elevations extracted from the laser altimeter aboard NASA's Mars Global Surveyor mission. New missions to Mars planned in the next few years include Insight with plans to drill into Mars, and ExoMars and the Mars 2020 Rover with plans to search for signs of microscopic Martian life -- past and present.
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
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Ημερομηνία εγγραφής : 17/06/2012
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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 20

Δημοσίευση  panosol Τετ Δεκ 20, 2017 7:45 pm

2017 December 20



How to Wash Your Hair in Space
Video Credit: NASA, Expedition 36 Crew

Explanation: How can you wash your hair in space -- without gravity? Long a bother for space-faring astronauts, Karen Nyberg, a flight engineer on the International Space Station (ISS) in 2013, gave a tutorial. Key components are a squirt package of water, no-rinse shampoo, and vigorous use of a towel and comb. Even so, the featured video shows that the whole process should take only a few minutes. Residual water will eventually evaporate from your hair, be captured by the space station's air conditioning system, and be purified into drinking water. After returning from a total of 180 days in space, Nyberg has worked for NASA in several capacities including as the Chief of Robotics branch.
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panosol

Αριθμός μηνυμάτων : 762
Points : 927
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Ημερομηνία εγγραφής : 17/06/2012
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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 21

Δημοσίευση  panosol Πεμ Δεκ 21, 2017 7:17 pm

2017 December 21
Astronomy Picture of the Day - Σελίδα 15 Winter_Solstice_MW_Seip

Solstice Sun and Milky Way
Composite Image Credit & Copyright: Stefan Seip (TWAN)

Explanation: Welcome to December's solstice, first day of winter in the north and summer for the southern hemisphere. Astronomical markers of the seasons, solstice and equinox dates are based on the Sun's place in its annual journey along the ecliptic, through planet Earth's sky. At this solstice, the Sun reaches its maximum southern declination of -23.5 degrees today at 16:28 UTC, while its right ascension coordinate on the celestial sphere is 18 hours. That puts the Sun in the constellation Sagittarius in a direction near the center of our Milky Way galaxy. In fact, if you could see today's Solstice Sun against faint background stars and nebulae (that's really hard to do, especially in the daytime ...) your view might look something like this composited panorama. To make it, images of our fair galaxy were taken under dark Namibian night skies, then stitched together in a panoramic view. From a snapshot made on December 21, 2015, the Sun was digitally overlayed as a brilliant star at today's northern winter solstice position, close to the center of the Milky Way.
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
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Ημερομηνία εγγραφής : 17/06/2012
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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 22

Δημοσίευση  panosol Παρ Δεκ 22, 2017 8:34 pm

2017 December 22
Astronomy Picture of the Day - Σελίδα 15 D4aad5dec5

Gemini's Meteors
Composite Image Credit & Copyright: Jeff Dai (TWAN)

Explanation: From dark skies above Heilongjiang province in northeastern China, meteors rain down on a wintry landscape in this beautiful composited night scene. The 48 meteors are part of last week's annual Geminid meteor shower. Despite temperatures of -28 degrees C, all were recorded in camera exposures made during the peak hour of the celestial spectacle. They stream away from the shower's radiant high above the horizon near the two bright stars of the zodiacal constellation of the Twins. A very active shower, this year the December 13-14 peak of the Geminids arrived just before the December 16 closest approach of asteroid 3200 Phaethon to planet Earth. Mysterious 3200 Phaethon is the Geminid shower's likely parent body.
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
Reputation : 15
Ημερομηνία εγγραφής : 17/06/2012
Ηλικία : 56

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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 23

Δημοσίευση  panosol Σαβ Δεκ 23, 2017 9:39 am

2017 December 23
Astronomy Picture of the Day - Σελίδα 15 E04c03fa6e

Phaethon's Brood
Image Credit & Copyright: Mikiya Sato (Nippon Meteor Society)

Explanation: Based on its well-measured orbit, 3200 Phaethon (sounds like FAY-eh-thon) is recognized as the source of the meteroid stream responsible for the annual Geminid meteor shower. Even though most meteor showers' parents are comets, 3200 Phaethon is a known and closely tracked near-Earth asteroid with a 1.4 year orbital period. Rocky and sun-baked, its perihelion or closest approach to the Sun is well within the orbit of innermost planet Mercury. In this telescopic field of view, the asteroid's rapid motion against faint background stars of the heroic constellation Perseus left a short trail during the two minute total exposure time. The parallel streaks of its meteoric children flashed much more quickly across the scene. The family portrait was recorded near the Geminid meteor shower's very active peak on December 13. That was just before 3200 Phaethon's historic December 16 closest approach to planet Earth.
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
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Ημερομηνία εγγραφής : 17/06/2012
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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 24

Δημοσίευση  panosol Κυρ Δεκ 24, 2017 8:53 am

2017 December 24
Astronomy Picture of the Day - Σελίδα 15 Space_XLaunch_Bobchin_5407

SpaceX Rocket Launch Plume over California
Image Credit & Copyright: Craig Bobchin

Explanation: What's happened to the sky? On Friday, the photogenic launch plume from a SpaceX rocket launch created quite a spectacle over parts of southern California and Arizona. Looking at times like a giant space fish, the impressive rocket launch from Vandenberg Air Force Base near Lompoc, California, was so bright because it was backlit by the setting Sun. Lifting off during a minuscule one-second launch window, the Falcon 9 Heavy rocket successfully delivered to low Earth orbit ten Iridium NEXT satellites that are part of a developing global communications network. The plume from the first stage is seen on the right, while the soaring upper stage rocket is seen at the apex of the plume toward the left. Several good videos of the launch were taken. The featured image was captured from Orange County, California, in a 2.5 second duration exposure.
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
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Ημερομηνία εγγραφής : 17/06/2012
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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 25

Δημοσίευση  panosol Δευ Δεκ 25, 2017 10:22 am

2017 December 25
Astronomy Picture of the Day - Σελίδα 15 Arctic_Geminid_Sutie_3500

Fireball in the Arctic
Image Credit & Copyright: Yang Sutie

Explanation: Something very bright suddenly lit up the arctic -- what was it? The original idea was to take a series of aurora images that could be made into a time-lapse video. But when night suddenly turned into day, the astrophotographer quickly realized that he was seeing something even more spectacular. Moving through the sky -- in front of the Big Dipper no less -- was a Geminid meteor so bright it could be called a fireball. The meteor brightened and flashed for several seconds as it went. By a stroke of good fortune, the aurora camera was able to capture the whole track. Taken the night after the Geminids Meteor Shower peaked, the astrophotographer's location was near Lovozero Lake in Murmansk, Russia, just north of the Arctic Circle.
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
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Ημερομηνία εγγραφής : 17/06/2012
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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 26

Δημοσίευση  panosol Τρι Δεκ 26, 2017 10:46 am

2017 December 26
Astronomy Picture of the Day - Σελίδα 15 Ngc1232b_vlt_3969

Grand Spiral Galaxy NGC 1232
Image Credit: FORS, 8.2-meter VLT Antu, ESO

Explanation: Galaxies are fascinating not only for what is visible, but for what is invisible. Grand spiral galaxy NGC 1232, captured in detail by one of the Very Large Telescopes, is a good example. The visible is dominated by millions of bright stars and dark dust, caught up in a gravitational swirl of spiral arms revolving about the center. Open clusters containing bright blue stars can be seen sprinkled along these spiral arms, while dark lanes of dense interstellar dust can be seen sprinkled between them. Less visible, but detectable, are billions of dim normal stars and vast tracts of interstellar gas, together wielding such high mass that they dominate the dynamics of the inner galaxy. Leading theories indicate that even greater amounts of matter are invisible, in a form we don't yet know. This pervasive dark matter is postulated, in part, to explain the motions of the visible matter in the outer regions of galaxies.
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
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Ημερομηνία εγγραφής : 17/06/2012
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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 27

Δημοσίευση  panosol Τετ Δεκ 27, 2017 7:23 pm

2017 December 27
Astronomy Picture of the Day - Σελίδα 15 3d02256e70

The Horsehead Nebula
Image Credit: CFHT, Coelum, MegaCam, J.-C. Cuillandre (CFHT) & G. A. Anselmi (Coelum)

Explanation: One of the most identifiable nebulae in the sky, the Horsehead Nebula in Orion, is part of a large, dark, molecular cloud. Also known as Barnard 33, the unusual shape was first discovered on a photographic plate in the late 1800s. The red glow originates from hydrogen gas predominantly behind the nebula, ionized by the nearby bright star Sigma Orionis. The darkness of the Horsehead is caused mostly by thick dust, although the lower part of the Horsehead's neck casts a shadow to the left. Streams of gas leaving the nebula are funneled by a strong magnetic field. Bright spots in the Horsehead Nebula's base are young stars just in the process of forming. Light takes about 1,500 years to reach us from the Horsehead Nebula. The featured image was taken with the large 3.6-m Canada-France-Hawaii Telescope in Hawaii, USA.
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
Reputation : 15
Ημερομηνία εγγραφής : 17/06/2012
Ηλικία : 56

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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 28

Δημοσίευση  panosol Πεμ Δεκ 28, 2017 8:26 pm

2017 December 28
Astronomy Picture of the Day - Σελίδα 15 Casa_life

Recycling Cassiopeia A
Image Credit: NASA, CXC, SAO

Explanation: Massive stars in our Milky Way Galaxy live spectacular lives. Collapsing from vast cosmic clouds, their nuclear furnaces ignite and create heavy elements in their cores. After a few million years, the enriched material is blasted back into interstellar space where star formation can begin anew. The expanding debris cloud known as Cassiopeia A is an example of this final phase of the stellar life cycle. Light from the explosion which created this supernova remnant would have been first seen in planet Earth's sky about 350 years ago, although it took that light about 11,000 years to reach us. This false-color Chandra X-ray Observatory image shows the still hot filaments and knots in the Cassiopeia A remnant. High-energy emission from specific elements has been color coded, silicon in red, sulfur in yellow, calcium in green and iron in purple, to help astronomers explore the recycling of our galaxy's star stuff - Still expanding, the blast wave is seen as the blue outer ring. The sharp X-ray image, spans about 30 light-years at the estimated distance of Cassiopeia A. The bright speck near the center is a neutron star, the incredibly dense, collapsed remains of the massive stellar core.
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
Reputation : 15
Ημερομηνία εγγραφής : 17/06/2012
Ηλικία : 56

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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 29

Δημοσίευση  panosol Παρ Δεκ 29, 2017 7:17 pm

2017 December 29
Astronomy Picture of the Day - Σελίδα 15 M78_l2_neyer2048

M78 Wide Field
Image Credit & Copyright: Fabian Neyer

Explanation: Interstellar dust clouds and glowing nebulae abound in the fertile constellation of Orion. One of the brightest, M78, is centered in this colorful, wide field view, covering an area north of Orion's belt. At a distance of about 1,500 light-years, the bluish reflection nebula is around 5 light-years across. Its tint is due to dust preferentially reflecting the blue light of hot, young stars. Reflection nebula NGC 2071 is just to the left of M78. To the right, and much more compact in appearance, the intriguing McNeil's Nebula is a recently recognized variable nebula associated with a young sun-like star. Deeper red flecks of emission from Herbig-Haro objects, energetic jets from stars in the process of formation, stand out against the dark dust lanes. The exposure also brings out the region's fainter pervasive glow of atomic hydrogen gas.
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
Reputation : 15
Ημερομηνία εγγραφής : 17/06/2012
Ηλικία : 56

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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 30

Δημοσίευση  panosol Σαβ Δεκ 30, 2017 9:08 am

2017 December 30
Astronomy Picture of the Day - Σελίδα 15 A17anaglyph_van_Meijgaarden_f

Apollo 17 VIP Site Anaglyph
Image Credit: Gene Cernan, Apollo 17, NASA; Anaglyph by Erik van Meijgaarden

Explanation: Get out your red/blue glasses and check out this stereo scene from Taurus-Littrow valley on the Moon! The color anaglyph features a detailed 3D view of Apollo 17's Lunar Rover in the foreground -- behind it lies the Lunar Module and distant lunar hills. Because the world was going to be able to watch the Lunar Module's ascent stage liftoff via the rover's TV camera, this parking place was also known as the VIP Site. In December of 1972, Apollo 17 astronauts Eugene Cernan and Harrison Schmitt spent about 75 hours on the Moon, while colleague Ronald Evans orbited overhead. The crew returned with 110 kilograms of rock and soil samples, more than from any of the other lunar landing sites. Cernan and Schmitt are still the last to walk (or drive) on the Moon.
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
Reputation : 15
Ημερομηνία εγγραφής : 17/06/2012
Ηλικία : 56

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Astronomy Picture of the Day - Σελίδα 15 Empty 2017 December 31

Δημοσίευση  panosol Κυρ Δεκ 31, 2017 9:18 am

2017 December 31
Astronomy Picture of the Day - Σελίδα 15 Freeflyer_nasa_3000

To Fly Free in Space
Image Credit: STS-41B, NASA

Explanation: What would it be like to fly free in space? At about 100 meters from the cargo bay of the space shuttle Challenger, Bruce McCandless II was living the dream -- floating farther out than anyone had ever been before. Guided by a Manned Maneuvering Unit (MMU), astronaut McCandless, pictured, was floating free in space. McCandless and fellow NASA astronaut Robert Stewart were the first to experience such an "untethered space walk" during Space Shuttle mission 41-B in 1984. The MMU worked by shooting jets of nitrogen and was used to help deploy and retrieve satellites. With a mass over 140 kilograms, an MMU is heavy on Earth, but, like everything, is weightless when drifting in orbit. The MMU was replaced with the SAFER backpack propulsion unit.


Memorial: Astronaut Bruce McCandless II died Dec. 21, 2017, at the age of 80
panosol
panosol

Αριθμός μηνυμάτων : 762
Points : 927
Reputation : 15
Ημερομηνία εγγραφής : 17/06/2012
Ηλικία : 56

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