Explanation: What's happening between those mountains? A rocket is being launched to space. Specifically, a Long March 3B Carrier Rocket was launched from Xichang Satellite Launch Center in Sichuan Province in China about two week ago. The rocket lifted two navigation satellites to about 2,000 kilometers above the Earth's surface, well above the orbit of the International Space Station, but well below the orbit of geostationary satellites. China's Chang'e 3 mission that landed the robotic Yutu rover on the Moon was launched from Xichang in 2013. The featured image was taken about 10 kilometers from the launch site and is actually a composite of nine exposures, including a separate background image.
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04/12/2018
Rocket Launch between Mountains - Astronomy picture of the day - 2018 December 4
03/12/2018
Spiraling Supermassive Black Holes - Astronomy picture of the day - 2018 December 3
Video Credit: NASA's Goddard Space Flight Center; Music: In the Hall of the Mountain King by Edvard Grieg
Explanation: Do black holes glow when they collide? When merging, co-orbiting black holes are sure to emit a burst of unusual gravitational radiation, but will they emit light, well before that, if they are surrounded by gas? To help find out, astrophysicists created a sophisticated computer simulation. The simulation and featured resulting video accurately depicts two spiraling supermassive black holes, including the effects of Einstein's general relativity on the surrounding gas and light. The video first shows the system from the top, and later from the side where unusual gravitational lens distortions are more prominent. Numerical results indicate that gravitational and magnetic forces should energize the gas to emit high-energy light from the ultraviolet to the X-ray. The emission of such light may enable humanity to detect and study supermassive black hole pairs well before they spiral together.
The Fairy of Eagle Nebula - Astronomy picture of the day - 2018 December 2
Explanation: The dust sculptures of the Eagle Nebula are evaporating. As powerful starlight whittles away these cool cosmic mountains, the statuesque pillars that remain might be imagined as mythical beasts. Featured here is one ofseveral striking dust pillars of the Eagle Nebula that might be described as a gigantic alien fairy. This fairy, however, is ten light years tall and spews radiation much hotter than common fire. The greater Eagle Nebula, M16, is actually a giant evaporating shell of gas and dust inside of which is a growing cavity filled with a spectacular stellar nursery currently forming an open cluster of stars. This great pillar, which is about 7,000 light years away, will likely evaporate away in about 100,000 years. The featured image in scientifically re-assigned colors was released in 2005 as part of the fifteenth anniversary celebration of the launch of the Hubble Space Telescope.
Nobel salue une révolution contre le cancer - Santé/Médecine
Des traitements d'immunothérapie sont déjà sur le marché, et de nombreux essais cliniques confirment le potentiel de ces molécules contre différents cancers avancés difficiles à traiter.
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Le prix Nobel de médecine 2018 a récompensé une découverte qui révolutionne aujourd'hui la prise en charge du cancer : l'immunothérapie. Chacun de leur côté, l'Américain James P. Allison, et le Japonais Tasuku Honjo ont mis à jour des molécules permettant de lever les freins de notre système immunitaire, pour qu'il puisse s'attaquer aux cellules cancéreuses. "Cela a permis d'établir un tout nouveau principe pour soigner le cancer", a souligné l'Assemblée Nobel de l'Institut Karolinska à Stockholm. Explications.
Depuis toujours, les cancérologues ont cherché à lutter contre le cancer en s'attaquant directement aux cellules tumorales : il s'agissait de les éliminer ou de les détruire par la chirurgie, la radiothérapie ou la chimiothérapie. James P. Allison, puis Tasuku Honsu, eux, ont trouvé chacun de leur côté des moyens d'agir sur le système immunitaire, de façon à ce que nos lymphocytes T, ces globules blancs qui défendent normalement notre organisme contre les agressions extérieures (virus, microbes...) s'attaquent également aux cellules cancéreuses.
James P. Allison a développé un anticorps monoclonal capable de venir bloquer l'action d'une molécule appelée CTLA-4 présente à la surface des lymphocyte T, et qui agit comme un frein. Il a été le premier à montrer chez des souris, dans un article paru dans Science en 1996, qu'un tel médicament pouvait entraîner une diminution, et dans certains cas une disparition complète, des tumeurs et de leurs métastases. Tasuku Honjo, lui, a découvert un autre "frein" du système immunitaire, PD1, et a développé une molécule pour bloquer ce frein. "C'est un paradigme révolutionnaire : on vient aider les patients à soigner leur cancer avec leurs propre globules blancs", résume le Dr Aurélien Marabelle, de Gustave-Roussy, un des centres français aujourd'hui les plus en pointe dans l'utilisation et les recherches sur l'immunothérapie.
L'Express - Sciences - France
01/12/2018
Mount Everest Star Trails - Astronomy picture of the day - 2018 December 1
Image Credit & Copyright: Jeff Dai (TWAN)
Explanation: The highest peak on planet Earth is framed in this mountain and night skyscape. On September 30, the digital stack of 240 sequential exposures made with a camera fixed to a tripod at an Everest Base Camp captured the sheer north face of the Himalayan mountain and foreground illuminated by bright moonlight. Taken over 1.5 hours, the sequence also recorded colorful star trails. Reflecting the planet's daily rotation on its axis, their motion is along gentle concentric arcs centered on the south celestial pole, a point well below the rugged horizon. The color of the trails actually indicates the temperatures of the stars. Blueish hues are from hotter stars, and yellow to reddish hues are from stars cooler than the Sun.
Magnésio e fibromialgia - Saude/Medecina
A Fibromialgia é uma síndrome que se caracteriza principalmente pela existência de dores generalizadas, cansaço extremo e perturbações no sono. Normalmente existe também a presença conjunta de vários outros sintomas que podem variar.
O magnésio é muito importante para a função do músculo, do sistema imunológico, do humor e da produção de energia, os quais tendem a ser prejudicados nos casos de fibromialgia. Não é surpreendente que muitas pessoas com fibromialgia beneficiem com o uso do magnésio.
Segundo o reumatologista do CREB – Centro de Reumatologia e Ortopedia Botafogo, Sérgio Rosenfeld, – o magnésio é responsável pela queima do açúcar e por reações que dão origem a compostos energéticos. “Os portadores de fibromialgia em geral apresentam deficiência de magnésio, mineral que ajuda no relaxamento dos músculos. A reposição desse mineral tem sido utilizada em muitos estados dolorosos, especialmente em cefaléias, com bons resultados. O magnésio também pode ajudar no sono e em espasmos ou cãibras”, explica o Dr. Sérgio.
O Magnésio ativa o enzima mais importante no corpo, ATP (trifosfato de adenosina) uma molécula de energia produzida dentro de um componente das células, chamada mitocondria, “forno” da energia do corpo. Cerca de 20 por cento da produção de ATP está localizada no cérebro. Como resultado, os níveis diminuídos podem reduzir as funções cognitivas do cérebro, um problema comum em pessoas com fibromialgia.
30/11/2018
Cancer du sein : une radiothérapie en 1 minute au lieu de 6 semaines, une première ! - Santé/Médecine
Grande première : une machine conçue par un médecin français a permis de soigner une patiente atteint de cancer du sein en seulement 1 minute de radiothérapie, au lieu de 6 semaines.
Remplacer 6 semaines de radiothérapie par… 40 secondes d'irradiation, c'est maintenant possible pour certaines patientes atteintes de cancer du sein. Réalisée pendant l'opération permettant d'ôter la tumeur, cette courte irradiation est rendue possible par un nouvel appareil, le Papillon +, conçu par le Pr Jean-Pierre Gérard, Radiothérapeute au Centre Antoine Lacassagne (Nice). En cours d'essai, il pourrait bientôt traiter 10% des malades, spécifiquement les plus âgées avec de petites tumeurs.
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Sciences et Avenir
A Cold River to Orion - Astronomy picture of the day - 2018 November 30
Image Credit & Copyright: Juris Sennikovs
Explanation: Ice is forming on the river Lielupe as it flows through the landscape in this winter's night scene. Even in motion the frigid water still reflects a starry sky, though. The well planned, Orion-centered panorama looks toward the south, taken in three exposures from a bridge near the village of Stalgene, Latvia, planet Earth. Drifting pancakes of ice leave streaks in the long exposures, while familiar stars of Orion and the northern winter night appear above and below the horizon. Village lights along the horizon include skyward beams from the local community church. This image was a first place winner in the 2018 StarSpace astrophotography competition.
Primeiras fotos do InSight em Marte. Pouso bem sucedido - Espaço
A espaçonave InSight da NASA pousou com sucesso no planeta Marte em 26 de novembro de 2018, enviando as primeiras fotos para a Terra a partir de sua localização em Marte, o mais investigado dos planetas do sistema solar, que até hoje já tem um novo instrumento, que ajudará os cientistas a estudar e entender o que é o interior profundo do planeta vermelho. Dados e Crédito Fonte de todas as imagens: NASA Jpl Caltech, Universidade do Arizona, Agência Espacial Europeia.
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