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HUDF 2012

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Le télescope Hubble a observé les galaxies les plus lointaines jamais vues. Le télescope spatial Hubble a pu observer des galaxies primitives formées il y a plus de 13 milliards d'années, peu de temps après le big bang, qui permettent d'en savoir un peu plus sur nos origines, a annoncé mercredi 12 septembre la NASA. Ces observations, effectuées sur six semaines en août et septembre, ont permis de découvrir sept nouvelles galaxies, dont la plus ancienne est âgée de 13,3 milliards d'années. "C'était une campagne d'observation très ambitieuse, on a pu remonter jusqu'à 13,3 milliards d'années, quelques millions d'années après le big bang. A cette époque, l'univers n'avait que 3 % de son âge actuel", a expliqué lors d'une conférence de presse Richard Ellis, astrophysicien à l'Institut de technologie de Californie à Pasadena, qui a participé à cette étude. L'âge estimé de l'univers est de 13,7 milliards d'années.

Plus les scientifiques observent loin, mieux ils peuvent appréhender ce qui se passait juste après la naissance supposée de l'univers. S Hubble Provides First Census of Galaxies Near Cosmic Dawn. NASA'S Hubble Provides First Census of Galaxies Near Cosmic Dawn › View larger This new image of the Hubble Ultra Deep Field (HUDF) 2012 campaign reveals a previously unseen population of seven faraway galaxies, which are observed as they appeared in a period 350 million to 600 million years after the big bang. Credit: NASA, ESA, R. Ellis (Caltech), and the UDF 2012 Team WASHINGTON -- Using NASA's Hubble Space Telescope, astronomers have uncovered a previously unseen population of seven primitive galaxies that formed more than 13 billion years ago, when the universe was less than 4 percent of its present age. The deepest images to date from Hubble yield the first statistically robust sample of galaxies that tells how abundant they were close to the era when galaxies first formed.

The results are from an ambitious Hubble survey of an intensively studied patch of sky known as the Ultra Deep Field (UDF). Looking deeper into the universe also means peering further back in time. Hubble Provides First Census of Galaxies Near Cosmic Dawn (12/12/2012) - The Full Story. The full news release story: View this image Using NASA's Hubble Space Telescope, astronomers have uncovered a previously unseen population of seven primitive galaxies that formed more than 13 billion years ago, when the universe was less than 3 percent of its present age. The deepest images to date from Hubble yield the first statistically robust sample of galaxies that tells how abundant they were close to the era when galaxies first formed. The results show a smooth decline in the number of galaxies with increasing look-back time to about 450 million years after the big bang. The observations support the idea that galaxies assembled continuously over time and also may have provided enough radiation to reheat, or reionize, the universe a few hundred million years after the big bang.

These pioneering observations blaze a trail for future exploration of this epoch by NASA's next-generation spacecraft, the James Webb Space Telescope. MAST HUDF12. Hlsp_hudf12_hst_w fc3ir_udfmain_f160w_f125w_f105w_v1.0 UDFMAIN F160W_F125W_F105WInteractive Display.