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5 fois la taille de la Terre: Géant tornade solaire pris dans la NASA cassette rare (VIDEO):
Une tornade géante solaire - cinq fois le diamètre de la Terre - tourbillonnant à la vitesse incroyable de certains mph 186000 a été capté sur vidéo par l'Observatoire de la NASA Solar Dynamics.
C'est la première fois un géant solaire twister a été capturé sur vidéo.
Tornades solaires, connus sous le nom des protubérances solaires, sont façonnées par le champ magnétique du soleil et se produisent souvent pendant les éjections de masse coronale - explosions énormes de plasma solaire. La vitesse de gaz tourbillonnant solaires peut parfois atteindre plusieurs milliers de miles par heure.
Cette tornade 124 000-mile de haut a été filmé le 25 Septembre 2011, mais la vidéo n'a été rendu public lors de la réunion national d'astronomie à Manchester (Royaume-Uni) le jeudi.
Xing Li, un astronome de l'Université d'Aberystwyth au Pays de Galles, estime que le constat est un "vrai petit bijou d'un événement de frapper l'imagination, et il est un bon moyen d'étudier les structures magnétiques dans l'atmosphère du soleil."
Les scientifiques pensent que l'étude de tornades solaires permettra de comprendre les causes des tempêtes de l'espace en général, qui est encore l'un des grands mystères de notre système solaire.
A giant solar tornado - five times the Earth's diameter - swirling at incredible speed of some 186,000 mph has been captured on video by NASA's Solar Dynamics Observatory.
This is the first time a giant solar twister has been caught on video.
Solar tornadoes, known as solar prominences, are shaped by the sun's magnetic field and often occur during coronal mass ejections -- huge explosions of solar plasma. The speed of swirling solar gases can sometimes reach several thousand miles per hour.
This 124,000-mile-tall tornado was filmed on September 25, 2011, but the video was only released to the public at the National Astronomy Meeting in Manchester (UK) on Thursday.
Xing Li, an astronomer at Aberystwyth University in Wales, believes the finding is a "real gem of an event to fire the imagination, and it is a good way to study magnetic structures in the sun's atmosphere."
Scientists believe that study of solar tornadoes will help understand the causes of space storms in general, which is still one of the great mysteries of our solar system.
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Guests: Peter Ward, Joyce Riley
In the first half of Wednesday's show, Professor Peter Ward discussed his studies of planetary science, Earth, and its turbulent changes, as well as alien worlds. Sea level has risen 15 ft. in the last 100 hundred years, and this brings on a rise in temperatures as the oceans expand. If this continues, the next generations will be saddled with the costs of building massive sea walls in order to protect cities and infrastructure, he commented.
Life on Earth began about 3.7 billion years ago, and was probably initiated through panspermia, via bacteria on meteorites from Mars, he said. "We are Martians, as far I'm concerned," Ward said, citing the work of Joseph Kirschvink at Cal Tech who noted that ribose (the backbone of RNA) comes from a desert environment, which Earth did not have back then. Ward advocated for space exploration to Saturn's moon Titan, which would be easier to land on because it has an atmosphere. Titan might contain long-chain silicon life forms, he theorized.
He reported that biologist Craig Venter has produced an "alien," by tinkering with the genetic code of a bacterium. He believes Venter has entered into a dangerous arena, as such creations might eventually be weaponized.
Vet Health Issues:
In the latter half of the show, nurse Joyce Riley shared an update on the health problems of Gulf War vets. A lot of US soldiers in Iraq were exposed to emissions from a sulfur mine, and troops in both Afghanistan & Iraq lived near burn pits used to dispose of items like electronics and military equipment. Many of these soldiers are now suffering from respiratory ailments, she reported (related article).
Riley recommended detoxification through food and diet for vets exposed to a variety of chemicals and conditions. "Hundreds of thousands of our military have been experimented upon, compromised, made ill, and died. Then they tell them that it's PTSD-- whether it is or not, that's always what they're told, which is so unfair to the troops and their families," she declaimed.
In the early hours of July 30, 2011 a fairly strong, but brief, M9-class solar flare occurred on Active Region 1261. Because it was brief it appears not to have hurled a large coronal mass ejection (CME) outwards. Additional analysis are underway.
Credit: NASA SDO