Etude sur l'environnement d'une comète à proximité du soleil

Lancé en 2004, le"chasseur" de comète Rosetta s'est réveillé de son hibernation le 20 janvier 2014, et a débuté la dernière phase de ses 10 ans de voyage vers la comète 67P/Churyumov-Gerasimenko. La mission spatiale Rosetta de l'Agence Spatiale Européenne (ESA) va étudier pour la première fois les environs d'une comète durant son périple autour du Soleil. L'Institut d'Aéronomie Spatiale de Belgique (IASB) a contribué à la fabrication de l'instrument ROSINA (Rosetta Orbiter Spectrometer for Ion and Neutral Analysis) embarqué sur la sonde.

Du fait de leur apparition soudaine dans le ciel nocturne, les comètes parlent à l'imagination des hommes depuis des temps immémoriaux. Le noyau d'une comète est composé de glace et de poussière et peut être considéré comme une"boule de neige sale" d'une taille de quelques kilomètres.

Mission spaciale Rosetta
Crédits : ESA

Lorsqu'une comète s'approche du Soleil, elle se réchauffe. Progressivement, une plus grande quantité de glace du noyau cométaire commence à s'évaporer. Le gaz et la poussière ainsi relâchés forment l'atmosphère cométaire. La queue de la comète (en fait, il y a deux queues, la queue ionique et la queue de poussière), qui est visible depuis la Terre, est créée par l'interaction du gaz et de la poussière cométaire avec le Soleil.

Atmosphère cométaire
Crédits : ESA

En mai, Rosetta débutera son orbite autour de la comète. La sonde prendra des photos et fera des mesures de l'atmosphère cométaire. L'instrument ROSINA est spécialement conçu pour déterminer la composition de l'atmosphère cométaire. La lumière ultra-violette du Soleil provoque toutes sortes de réactions chimiques dans le gaz.

Instrument Rosina
Crédits : ESA

L'IASB a développé un modèle informatique qui prend en compte ces réactions pour déterminer, à l'aide des mesures de ROSINA, la composition de la matière s'évaporant à la surface du noyau cométaire.

Rosetta transporte un petit atterrisseur appelé Philae qui descendra sur le noyau cométaire en novembre. Les résultats du modèle informatique pourront alors être comparés avec les mesures de l'atterrisseur. Cela fournira des indications sur les processus chimiques et physiques qui se produisent dans l'atmosphère cométaire.

Pourquoi les scientifiques ont-ils hâte d'examiner la comète de si près ?

On estime que les comètes sont des sortes de fossiles qui remontent à l'époque de la naissance du système solaire, il y a plus de 4 milliards d'années. Tout comme la pierre de Rosette a permis de déchiffrer les hiéroglyphes il y a 200 ans, on espère que la mission Rosetta aidera à dévoiler les secrets de l'origine de notre système solaire et apportera peut-être un nouvel éclairage sur l'origine de la vie sur Terre.

Les comètes pourraient en effet être la source de l'eau présente sur Terre et éventuellement avoir apporté les briques élémentaires nécessaires à l'apparition de la vie sur Terre.

http://www.bulletins-electroniques.com/actualites/075/75153.htm

Comments

[neo]

http://earthsky.org/brightest-stars/sirius-the-brightest-star


 




Star of the week: Sirius is Dog Star and brightest star








Sirius A and B











Sirius – in the constellation Canis Major the Greater Dog – is the sky’s brightest star. It’s very easy to spot on winter and spring evenings.



















 




:







The brightest star visible from any part of Earth is Sirius in the constellation Canis Major the Greater Dog. Sirius is sometimes called the Dog Star. Follow the links below to learn more
about Sirius, the Dog Star and brightest star.


How to see Sirius.


History and mythology of Sirius.


Sirius science.




Image Credit: Yuuji Kitahara





Orion's Belt points to Sirius



How to see Sirius. Most people in the Northern Hemisphere notice Sirius in the southeast – south – or southwest on evenings from winter to mid-spring. February evenings are a
grand time to see it. It’s also fun to spot Sirius as it ascends in the east before dawn on late summer mornings. Whenever you see Sirius, you’ll recognize it easily because it is our sky’s
brightest star.


Although white to blue white in color, Sirius might be called a rainbow star, as it often flickers with many colors.


The brightness, twinkling and color changes sometimes prompt first-time observers to report Sirius as a UFO. But these changes have nothing to do with Sirius. Rather, they are what happens
when such a bright star as Sirius shines through the blanket of Earth’s atmosphere. The light from Sirius, which often appears fairly low in the sky from the mid-north latitudes, passes
through a long column of air before it reaches our eyes. Changes in density and temperature of this air affect the light and cause the flickering and shimmering we see when we gaze at this
star. This happens for other stars, too, but it is more noticeable for Sirius because it is so bright, and because it appears low in the sky.


From the mid-northern latitudes such as most of the U.S., Sirius rises in the southeast, arcs across the southern sky, and sets in the southwest. In December, you’ll find Sirius rising in
mid-evening. By mid-April, Sirius is setting in the southwest in mid-evening.


Sirius is always easy to find. It’s the sky’s brightest star! Plus, anyone familiar with the constellation Orion can simply draw a line through Orion’s Belt, to the left. This line will point
to Sirius, which is roughly 8 times as far from the Belt as the Belt is wide.




The Egyptian god Osiris



History and mythology of Sirius. Sirius is also well known as the Dog Star, because it is the chief star in the constellation Canis Major, the Big Dog. Have you ever heard
anyone speak of the dog days of summer? Sirius is behind the sun as seen from Earth in Northern Hemisphere summer. In late summer, it appears in the east before sunrise – near the sun in our
sky. The early stargazers might have imagined that the double-whammy of Sirius and the sun caused the hot weather, or dog days.


Sirius has been known since ancient times, and its name signified its nature as “scorching” or “sparkling.” It was associated with the Egyptian god Osiris and other gods. Ancient Egyptians
noted that Sirius rose just before the sun each year immediately prior to the annual flooding of the Nile River. Although the floods could bring destruction, they also brought new soil and
new life. Fittingly, Osiris, whom Sirius may have represented, was a god of life, death, fertility and rebirth of plant life along the Nile.


In India, Sirius is sometimes known as Svana, the dog of Prince Yudhistira. The prince and his four brothers, along with Svana, set out on a long and arduous journey to find the kingdom of
heaven. However, one by one the brothers all abandoned the search until only Yudhistira and Svana were left. At long last they came to the gates of heaven. The gatekeeper, Lord Indra,
welcomed the prince but denied Svana entrance. Yudhistira was aghast and told Lord Indra that he could not forsake his good and faithful servant and friend. His brothers, Yudhistira told the
Lord, had abandoned the journey to heaven to follow their hearts’ desires. But Svana, who had given his heart freely, chose to follow none but Yudhistira. The prince told the Lord that
without his dog, he would forsake even heaven. This is what Lord Indra had wanted to hear, and then he welcomed both the prince and the dog through the gates of heaven.




This Hubble Space Telescope image shows Sirius A, the brightest star in our night sky, along with Sirius B, its faint, tiny stellar companion. Sirius B is the faint, tiny dot at the lower
left. Sir. Image credit: H. Bond (STScI) and M. Barstow (University of Leicester)



Sirius science. Magnitude is a star’s brightness expressed by a number. The smaller the number, the brighter the star. The visual magnitude of Sirius is -1.44, lower than any
other star. It is 3.5 times brighter than Arcturus in Bootes, the next brightest star easily visible from the northern hemisphere. There are brighter stars in terms of actual energy and light
output, but they are farther away and hence dimmer. Normally, the only objects that outshine Sirius in our heavens are the sun, moon, Venus, Jupiter, Mars and Mercury (and usually Sirius
outshines the latter two!).


The next brightest star (Canopus) after Sirius, and the closest major star (Alpha Centauri) are both too far south in the sky to be easily seen from mid-north latitudes.


At 8.6 light-years distance, Sirius is one of the nearest stars to us after the sun.
(A light year is nearly 6 trillion miles!) In fact it is the nearest star easily visible to the unaided eye from most of the northern hemisphere. Classified by astronomers as an “A” type
star, it is much hotter than our sun, with about surface about 17,000 degrees F (the sun is about 10,000 degrees F). With slightly more than twice the mass of the sun and just less than twice
its diameter, Sirius still puts out 26 times as much energy. It is considered a normal (main sequence) star, meaning that it produces most of its energy by converting hydrogen into helium
through nuclear fusion.


How astronomers know the mass of Sirius, the binary star


Sirius has a small, faint companion star appropriately called The Pup. That name signifies youth, but in fact the companion to Sirius is a dead star called a white dwarf. Once a mighty star,
today The Pup is an Earth-sized ember too faint to be seen without a telescope.


T

[neo]

http://earthsky.org/space/interstellar-magnetic-fields-warp-as-our-sun-and-heliosphere-move-through-galaxy?utm_source=EarthSky+News&utm_campaign=16f32679e2-EarthSky_News&utm_medium=email&utm_term=0_c643945d79-16f32679e2-393511181




Interstellar magnetic fields warp as our sun and heliosphere move through galaxy

















This illustration shows our heliosphere – the sphere of the sun’s influence – moving through the space of our Milky Way galaxy.
















The blue “globe” in this illustration is a representation of our heliosphere – the sphere of our sun’s influence – sometimes described as a “bubble” around our sun. Outside the heliosphere is
interstellar space, the space between the stars. This model shows the interstellar magnetic fields – which, if our sun weren’t in the way, would be straight – warping around the outside of
our heliosphere as it travels through the space of our Milky Way galaxy. The red arrow shows the direction in which our sun and its solar system moves through the galaxy. Read more about this illustration from NASA’s Interstellar
Boundary Explorer.




A model of the interstellar magnetic fields warping around the outside of our heliosphere, based on data from NASA’s Interstellar Boundary Explorer. The red arrow shows the direction in
which our solar system moves through the galaxy. Image via NASA/IBEX/UNH







MORE FROM EARTH SKY



Third-ever photo of Earth from outer solar
system today  




Brad Schaefer: ‘Betelgeuse could become a supernova any day now.’  




Best images from China’s Chang’e moon mission so far
 




Kepler discovers a wobbly planet with weird seasons
 




Betelgeuse braces for a collision  





FROM AROUND THE WEB



(BBC)


















Recommended by







Deborah Byrd






Deborah Byrd is Founder and President of EarthSky, which she created in 1991. EarthSky is a digital publisher that brings science and nature to millions of people around the world. Byrd
blogs at EarthSky.org and serves as editor-in-chief of this website and of Espanol.EarthSky.org. She produced the EarthSky radio series from 1991 to 2013. She has won a galaxy of awards
from the broadcasting and science communities, including having an asteroid named 3505 Byrd in her honor. A science communicator and educator since 1976, Byrd believes in science as a
force for good in the world and as a vital tool for the 21st century. Astrophysics, the night sky and imagining space travel remain among her most enduring lifelong passions.





Today's Image





Maui forest mist




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Matt Daniel's WeatherGlobe
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Content Partners



















 

[neo]

http://earthsky.org/earth/best-photos-beautiful-lenticular-clouds-around-the-world


http://vimeo.com/86856752


By Deborah Byrd in
Blogs | Photos | Earth on Feb 17, 2014









Best photos: Beautiful lenticular clouds around the world








Lenticular cloud, by Chris Walker, 2008











These lens-shaped clouds are often mistaken for UFOs. Here how they form, plus the best in photos and video.
















Here are seven photos and a video of beautiful lenticular clouds. EarthSky friends on Facebook and Google+ took the photos in various places around the world. These lens-shaped clouds typically form
where stable moist air flows over a mountain or a range of mountains. When this happens, a series of large-scale standing waves may form on the mountain’s downwind side. If the
temperature at the crest of the wave drops to the dew point, moisture in the air may condense to form lenticular clouds. As the moist air moves back down into the trough of the wave, the
cloud may evaporate back into vapor. So lenticular can appear and disappear relatively quickly. Plus they’re not familiar to people who live in low-lying or flat terrain. And, just to
confound things, lenticular clouds have also been known to form in non-mountainous places, as the result of shear winds created by a front. For all of these reasons, lenticular clouds are
often mistaken for UFOs (or “visual cover” for UFOs). Enjoy the photos! Thank you to all who posted.


 


Lenticular Timelapse from Michael Fuchs on Vimeo.




Radek Zek Photography caught this lenticular cloud in September 2013.





Emilio Lepeley of Vicuna, Chile captured this lenticular cloud in August 2013.





Jackie Phillips in Virginia caught this lenticular cloud on October 31, 2012.





John Lloyd Griffith in north Wales captured this lenticular cloud on December 22, 2013.





Beautiful shot of lenticular cloud at sunset by Chris Walker in Dayton, Nevada. Taken in spring 2008.





David Marshall captured this lenticular cloud above the Alps in northern Italy.





This last photo comes from Michel Studinger of Project IceBridge. It’s a lenticular cloud over Antarctica, November 24, 2013.



Bottom line: Photos and video of lenticular clouds in various parts of the world, from EarthSky’s community on Facebook and G+.




MORE FROM EARTH SKY




Giant underwater waves show their power  




View from space: Earth’s tallest mountain




An ancient underwater forest in the Gulf of Mexico




Crocodiles climb trees




Flower preserved in 100-million-year old amber one of most
complete ever found

[neo]

Actualités










Une proto-étoile révèle
un nouveau scénario pour la formation des planètes


 


Jeudi, 13
Février 2014



Une équipe internationale d’astronomes, impliquant des chercheurs de l'IPAG-OSUG (CNRS/Université Joseph Fourier Grenoble I) et de l’IRAP-OMP (CNRS/Université Paul Sabatier Toulouse III),
a observé pour la première fois la proto-étoile L1527 à très haute résolution spatiale à l'aide de ...










Les éoliennes
modifient-elles le climat européen ?


Communiqué de presse


Mardi, 11
Février 2014



Le développement des fermes éoliennes en Europe modifie le climat de façon extrêmement faible à l’échelle du continent, et cela restera le cas au moins jusqu’en 2020. Telles sont les
principales conclusions d’une étude menée par des chercheurs du CNRS, du CEA et de l’UVSQ(1), en collaboration ...










Une méthode innovante
pour une meilleure quantification de l'influence humaine sur le climat


 


Jeudi, 6
Février 2014



Une équipe de chercheurs du Groupe d’étude de l’atmosphère météorologique (GAME/CNRM, Météo-France / CNRS) et du CERFACS a développé une nouvelle méthode d’analyse statistique de l’impact
des activités humaines sur le climat, plus précise que les précédentes. Celle-ci a été appliquée aux ...







Manifestations










Sous la mer, un
monde


Exposition, Villa Méditerranée, Marseille, entrée libre et gratuite


Vendredi, 14
Mars 20

[neo]

http://www.insu.cnrs.fr/node/4738

[neo]

* Somerset Levels Swamped
 http://earthobservatory.nasa.gov/IOTD/view.php?id=83157&src=eoa-iotd

* Skiing Sochi
 http://earthobservatory.nasa.gov/IOTD/view.php?id=83131&src=eoa-iotd

* Sochi at Night
 http://earthobservatory.nasa.gov/IOTD/view.php?id=83149&src=eoa-iotd

* Extratropical Cyclone over the United Kingdom
 http://earthobservatory.nasa.gov/IOTD/view.php?id=83127&src=eoa-iotd

* Indonesia's Mount Kelut Erupts
 http://earthobservatory.nasa.gov/IOTD/view.php?id=83144&src=eoa-iotd

* Drought Stressing California's Plantscape
 http://earthobservatory.nasa.gov/IOTD/view.php?id=83124&src=eoa-iotd

* City-sized Fire in Australia
 http://earthobservatory.nasa.gov/IOTD/view.php?id=83117&src=eoa-iotd

* Changed Landscape Around Sinabung
 http://earthobservatory.nasa.gov/IOTD/view.php?id=83080&src=eoa-iotd

[neo]

à noter : une M 2.8 il y a 12h dans les Pyrénées ...


 



Type: EarthQuake
12 hours ago
Magnitude: 2.8
DateTime: 2014-02-18 21:45:56
Region: Pyrenees
Depth: 2
Source: CSEM-EMSC Feed

[neo]

Space Weather News for Feb. 19, 2014
http://spaceweather.com

CME IMPACT: A minor geomagnetic storm was already in progress during the early hours of  Feb. 19th when a CME struck Earth's magnetic field. The impact revved-up the storm and sent Northern
Lights spilling across the Canadian border into the United States.   Visit http://spaceweather.com for updates and
images of the display.

[neo]

http://earthsky.org/earth/earth-orbiting-satellites-see-arctic-surface-darkening-faster?utm_source=EarthSky+News&utm_campaign=82291748f2-EarthSky_News&utm_medium=email&utm_term=0_c643945d79-82291748f2-393511181


 


http://youtu.be/sCxIqgZA7ag


 


EarthSky // Earth, Science Wire Release
Date: Feb 18, 2014








Earth-orbiting satellites see Arctic surface darkening faster




The retreat of Arctic sea ice is diminishing Earth’s albedo, or reflectivity, by an amount about twice as large as previously thought.






This image shows a visualization of Arctic sea ice cover on Sept. 12, 2013 – around the time of Arctic sea ice minimum for 2013 – with a yellow line showing the 30-year average minimum
extent. Last year’s sea ice minimum extent was substantially larger than 2012′s record low, but still the sixth-lowest sea ice extent of the satellite record. Image via NASA Goddard’s
Scientific Visualization Studio/Cindy Starr



The retreat of sea ice in the Arctic is diminishing Earth’s albedo, or reflectivity, by an amount considerably larger – about twice as large – as that estimated in previous studies.
That’s according to a new study using data from several NASA satellites, whose results were announced today (February 18, 2014). As the sea ice melts, the Arctic’s icy white reflective surface
is replaced by a relatively dark ocean surface. This change diminishes the amount of sunlight being reflected back to space, causing Earth to absorb an increasing amount of solar energy,
thereby creating additional warming.


Researchers at Scripps Institution of Oceanography, at the University of California, San Diego, conducted the study. They used data from the Clouds and Earth’s Radiant Energy System, or CERES,
instrument on several NASA satellites.


They say the Arctic has warmed by 3.6 F (2 C) since the 1970s. The summer minimum Arctic sea ice extent has decreased by 40 percent during the same time period. These factors have decreased the
region’s albedo, or the fraction of incoming light that Earth reflects back into space. The CERES instruments are able to measure this change.


Scripps graduate student Kristina Pistone and climate scientists Ian Eisenman and Veerabhadran Ramanathan used satellite measurements to calculate Arctic albedo changes associated with the
changing sea ice cover. Albedo is measured as a percentage. A perfectly black surface has an albedo of zero percent and a perfectly white surface has an albedo of 100 percent. The albedo of
fresh snow is typically between 80 and 90 percent whereas the albedo of the ocean surface is less than 20 percent. Clouds and other factors, like aerosols and black carbon, also influence the
albedo of Earth.


The researchers calculated that the overall albedo of the Arctic region fell from 52 percent to 48 percent between 1979 and 2011. The magnitude of surface darkening is twice as large as that
found in previous studies. They also compared their results to model simulations to assess the capability of computer models to portray and forecast albedo changes.


Read more about the new study on Arctic albedo from NASA


The video below uses the “Daisyworld” model to explain basic Earth science concepts, such as albedo and feedback loops. James Lovelock – who is known for his Gaia hypothesis – and Andrew Watson first used the concept of a “Daisyworld” in a paper published in 1983.


Bottom line: The retreat of sea ice in the Arctic is diminishing Earth’s albedo, or reflectivity, by an amount about twice as large as previously thought.

[neo]

http://earthsky.org/tonight/waning-moon-planet-mars-star-spica-again-on-february-19?utm_source=EarthSky+News&utm_campaign=82291748f2-EarthSky_News&utm_medium=email&utm_term=0_c643945d79-82291748f2-393511181


 



Moon, Mars, Spica again on February 19













Tonight for February 19, 2014


Courtesy U.S. Naval Observatory





The bright objects near the moon again tonight are the red planet Mars – now nearly at its best for all of 2014 – and the blue-white star Spica in the constellation Virgo. Can’t see the moon?
You need to wait until mid to late evening for the moon to rise over your horizon. In the northern tropics and Southern Hemisphere, the threesome – the moon, Mars and Spica – rises by
early-to-mid evening. At mid-northern latitudes, they rise later, possibly (or not) climbing your horizon before your bedtime.


After they come up tonight, the waning gibbous moon, Mars and Spica will be out for the rest of the night. The trio
will be highest up for the night around 3 to 4 a.m. on February 20, and in the western half of sky by dawn. You can distinguish Mars from Spica because it’s the brighter luminary and this world
probably shines with a steadier light than the twinkling stars.


Mars will stay in the vicinity of Spica for months to come. We’ve said it before but we’ll say it again. In 2014, you can use the Big Dipper to arc to Arcturus, spike Spica – and make your way to Mars. See the chart below, designed for mid-northern latitudes.




At northerly latitudes, use the Big Dipper to find the star Spica and the planet Mars.



However, you can also see the Big Dipper from the tropical and sub-tropical latitudes in the Southern Hemisphere, though it won’t be until the wee hours after midnight at subtropical latitudes.
From the Southern Hemisphere, it may be easier to use the constellation Corvus as your guide to Spica – and Mars.




From southerly latitudes, use the constellation Corvus to locate Spica and Mars.



Bottom line: On the night of February 19, 2014, let the moon be your guide to the red planet Mars and blue-white star Spica in the constellation Virgo. They’ll rise about one-half hour earlier
each following week, or about two hours earlier with each passing month. By the time early April 2014 rolls around, look for Mars and Spica to be shining in the vicinity of one another from
dusk until dawn!


We Love Our Fans Sale going on now. Order your 2014 EarthSky lunar calendar today at a 50% discount!


A planisphere is virtually indispensable for beginning stargazers. Order your EarthSky Planisphere today.



Bruce McClure




MORE FROM EARTH SKY



February 2014 guide to the five visible
planets  




Waning moon, Saturn and Antares before dawn February 22
 




For those at southerly latitudes, the bright star Canopus!




Star of the week: Sirius is Dog Star and brightest star




Venus brightest in mid-February for all of 2014





FROM AROUND THE WEB

[neo]

http://earthsky.org/astronomy-essentials/mars-2014-opposition-how-to-see-april-best-time-to-see-brightest?utm_source=EarthSky+News&utm_campaign=82291748f2-EarthSky_News&utm_medium=email&utm_term=0_c643945d79-82291748f2-393511181


 


By Deborah Byrd and Bruce McClure in
Tonight | Astronomy Essentials | Space on
Feb 18, 2014









When to see Mars in 2014








Mars and M44 image by Peter Wienerroither











Mars has good years in our sky, and it has years in which you hardly notice it. 2014 is a good year! Look for Mars tonight.


















Mars with its mysterious dark markings and a white polar cap easily visible. Image Credit: NASA



Mars alternates between good and bad years for viewing in our sky, and 2014 is a good year! Why? Because Earth will fly between the sun and Mars on April 8, 2014, and, for the months around
that time, Mars will be at its brightest and best for this two-year period. It’ll also be in a convenient place for viewing. Between now and April, you can start watching for Mars in the
night sky. Mars looks like a bright red star, although it shines with a steadier light than the twinkling stars. This week is an especially good time to identify Mars, because the moon is near Mars in the night sky around February 18 and 19. Follow the links below
to learn more about seeing Mars in 2014.



When should I look for Mars?



Why will Mars be brightest and best in April, 2014?



Every opposition of Mars is special.



Can you still see Mars after April 2014?




View larger. | Mars was brilliant while near the star cluster M44 in mid April 2010. It is the bright reddish
object in the upper left of this beautiful image by Peter Wienerroither. Used with permission.





In January-July 2014, Mars shines in front of the constellation Virgo, at times near the bright star Spica. In late January, look for Mars from midnight until dawn. It was near the moon on
the mornings of January 22 and 23. This chart shows January 23. Read
more.



When should I look for Mars? Short answer: tonight!


January, 2014. Mars spends the month of January 2014 getting brighter and more noticeable. It’s rising in the middle of the night in January, and, around daybreak, shines at or near
its highest point in the sky. Mars, in front of the constellation Virgo the Maiden, shines close to the star Spica on the sky’s dome in January. It is already brighter than Spica. It’ll get
brighter still as Earth sweeps from from behind Mars in our smaller and faster orbit around the sun, causing the distance between our two worlds to decrease.




Next time to let the moon help you identify Mars: February 18 and 19. This chart shows a late-night view on February 18.



February, 2014. Mars is still in front of Virgo, still near the bright star Spica. By early February, Mars is rising in the east around 11 p.m. local time (the time on your clock, no
matter where you are on the globe). By late February, it’s coming up around 10 p.m. local time. Mars reaches its highest point for the night about one hour before dawn in early February and
about two hours before dawn late in the month. Summer solstice in the Mars’ northern hemisphere takes place on February 15.


March, 2014. In March, Mars is in Virgo, near Spica, still. Mars will be rising in mid-evening in March, becoming much more conspicuous in our sky. It’ll begin retrograde motion on
March 1, a sure sign that its opposition is approaching.


April, 2014. At opposition on April 8, 2014, Mars in Virgo, will
be opposite the sun in Earth’s sky. The sun, Earth and Mars will be located along a line in space, as viewed from above. As seen in Earth’s sky, Mars will be rising in the east when the sun
is setting in the west. It’ll be bright! And it’ll be fiery red in color. April will be the best month in 2014 to view Mars through a telescope because then Earth and Mars will be closest
together, and Mars will appear biggest through the eyepiece of your ‘scope. In April 2014, the north pole of Mars will be tilted 22 degrees toward Earth. It’ll be summertime in that
hemisphere of Mars, and Mars polar cap will be shrinking in size.


Follow Mars throughout 2014 with EarthSky’s guide to the five
visible planets – updated monthly.

[niel]

L'étude de cette comète nous permet de mieux comprendre nos origines cosmiques mais elle ne permet pas de comprendre nos origines spirituelles... Nous sommes, certes, des pourssières d'étaoiles
et nous serons balayés comme tels le jour du jugement dernier (le plus tard possible, je l'espère). En attendant, il faut s'accrocher et se battre. 


Bon courage à tous et bonne journée.


un petit lien très instructif pour comprendre la politique impérialiste de l'occident et ses conséquences à nos portes (lire l'article "le plan imperialiste de 13 ans pour la syrie") :


http://www.voltairenet.org/article181883.html

[Ferlinpimpim]

Ils ne veulent surtout pas que nous retrouvions nos origines spirituelles. Pourtant, c'est d'une facilité déconcertante...


Merci pour le lien. Pour nous aussi, il y a un plan et il est bien avancé.