Caché derrière un voile de poussière dans la constellation du Cygne est une pépinière stellaire appelé DR21, qui donne naissance à certaines des étoiles les plus massives de notre galaxie. Les images en lumière visible ne révèlent aucune trace de ce chaudron interstellaire en raison d'un obscurcissement de la poussière. En fait, la lumière visible est atténuée dans DR21 par un facteur de plus de 10 000 000 000, 000,000,000,000,000,000,000,000,000,000 heptillion (dix mille milliards). De nouvelles images au télescope spatial Spitzer de la NASA nous permettent de les identifier et de voile cosmique l'une des plus massives étoiles natal encore vu dans notre galaxie. T

• Contributeur: NASA Image Collection / Alamy Banque D'Images
• ID de l’image: KRJ7D5
• Taille du fichier: 7,1 MB (621,4 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 1767 x 1414 px | 29,9 x 23,9 cm | 11,8 x 9,4 inches | 150dpi

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Hidden behind a shroud of dust in the constellation Cygnus is a stellar nursery called DR21, which is giving birth to some of the most massive stars in our galaxy. Visible light images reveal no trace of this interstellar cauldron because of heavy dust obscuration. In fact, visible light is attenuated in DR21 by a factor of more than 10, 000, 000, 000, 000, 000, 000, 000, 000, 000, 000, 000, 000, 000 (ten thousand trillion heptillion). New images from NASA's Spitzer Space Telescope allow us to peek behind the cosmic veil and pinpoint one of the most massive natal stars yet seen in our Milky Way galaxy. The never-before-seen star is 100, 000 times as bright as the Sun. Also revealed for the first time is a powerful outflow of hot gas emanating from this star and bursting through a giant molecular cloud. The colorful image (top panel) is a large-scale composite mosaic assembled from data collected at a variety of different wavelengths. Views at visible wavelengths appear blue, near-infrared light is depicted as green, and mid-infrared data from the InfraRed Array Camera (IRAC) aboard NASA's Spitzer Space Telescope is portrayed as red. The result is a contrast between structures seen in visible light (blue) and those observed in the infrared (yellow and red). A quick glance shows that most of the action in this image is revealed to the unique eyes of Spitzer. The image covers an area about two times that of a full moon. Each of the constituent images is shown below the large mosaic. The Digital Sky Survey (DSS) image (lower left) provides a familiar view of deep space, with stars scattered around a dark field. The reddish hue is from gas heated by foreground stars in this region. This fluorescence fades away in the near-infrared Two-Micron All-Sky Survey (2MASS) image (lower center), but other features start to appear through the obscuring clouds of dust, now increasingly transparent. Many more stars are discerned in this image because near-infrared light pierces through some of

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