Planets orbiting stars other than our Sun. To date none have been directly imaged; most have been detected by their gravitational effect on their star causing a periodic shift in the spectral lines of the star. A few planets have also been detected by their transiting actross the face of a star.
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La science-fiction est un genre artistique qui fait des hypothèses sur ce que pourrait être le futur et/ou les univers inconnus (planètes éloignées, etc.), en partant des connaissances actuelles (scientifiques, technologiques, ethnologiques, etc.). Il est parfois confondu, à tort, avec le fantastique, genre qui inclut une dimension d'inexplicable, ou avec la fantasy, qui parle de mondes magiques.
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Détecter une exoplanète de manière directe n'est pas une chose facile, et ce pour plusieurs raisons :
* une planète ne produit pas de lumière : elle ne fait que refléter celle qu'elle reçoit de son étoile, ce qui est bien peu.
* la distance qui nous sépare de l'étoile est infiniment plus importante que celle qui sépare l'exoplanète et son étoile : le pouvoir séparateur des instruments de détection doit donc être très élevé pour pouvoir les distinguer.
Ainsi, les seules méthodes de détection qui fonctionnaient jusqu'à très récemment sont appelées méthodes "indirectes", car elles ne détectent pas directement les photons venant de la planète. Il existe plusieurs méthodes, présentes et futures pour détecter une exoplanète. La plupart sont détectées depuis les observatoires aux sols.
SATURN AFTER EQUINOX The other side of Saturn's ring plane is now directly illuminated by the Sun. For the previous 15 years, the southern side of Saturn and its rings were directly illuminated, but since Saturn's equinox in August, the orientation has reversed. Pictured above last month, the robotic Cassini spacecraft orbiting Saturn has captured the giant planet and its majestic rings soon after equinox. Imaged from nearly behind, Saturn and its moon Tethys each show a crescent phase to Cassini that is not visible from Earth. As the rings continue to point nearly toward the Sun, only a thin shadow of Saturn's rings is visible across the center of the planet. Close inspection of Saturn's rings, however, shows superposed bright features identified as spokes that are thought to be groups of very small electrically charged ice particles. Understanding the nature and dynamics of spokes is not fully understood and remains a topic of research.
I Wish you a Fabulous End of the Week My Dearly Friend. Thought & kisses from France :)
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STARS OVER EASTER ISLAND Why were the statues on Easter Island built? No one is sure. What is sure is that over 800 large stone statues exist there. The Easter Island statues, stand, on the average, over twice as tall as a person and have over 200 times as much mass. Few specifics are known about the history or meaning of the unusual statues, but many believe that they were created about 500 years ago in the images of local leaders of a lost civilization. Pictured above, a large stone statue appears to ponder the distant Large Magellanic Cloud before a cloudy sky that features the bright stars Canopus and Sirius.
Have a Magical Day my Dealy friend GALACTIC LOVE & KISS ★~S~★
"When beauty is reflected through things in the world,it is but a reminder that there is real beauty of a lasting nature."
Hi sweetie! Thankyou and thankyou ahead of time for your patience and understanding. Never enough time to spend on here, I'm truly grateful for your friendship! Have a refreshing and memorable day! ;0)
Always with love, happiness and joy! ~OneMLD~ xoxo
Self-respect cannot be hunted. It cannot be purchased. It is never for sale. It cannot be fabricated out of public relations. It comes to us when we are alone, in quiet moments, in quiet places, when we suddenly realize that, knowing the good, we have done it; knowing the beautiful, we have served it; knowing the truth we have spoken it. Have a rewarding and satisfying weekend. If you have an interest in following up on Cosmic ordering then you can see more details at my site: http://www.cosmicordering.net
"The principles of living greatly include the capacity to face trouble with courage, disappointment with cheerfulness, and trial with humility"- Thomas S. Monson
GIGAGALAXY ZOOM : GALACTIC CENTER From Sagittarius to Scorpius, the central Milky Way is a truly beautiful part of planet Earth's night sky. The gorgeous region is captured here, an expansive gigapixel mosaic of 52 fields spanning 34 by 20 degrees in 1200 individual images and 200 hours of exposure time. The breathtaking cosmic vista shows off intricate dust lanes, bright nebulae, and star clusters scattered through our galaxy's rich central starfields. Starting on the left, look for the Lagoon and Trifid nebulae, the Cat's Paw, the Pipe dark nebula, and the colorful clouds of Rho Ophiuchi and Antares.
