Una nube stellare in formazione fotografata dalla NASA

NASA handout photograph made available 17 August 2010 showing an infrared image taken by NASA’s Wide-field Infrared Survey Explorer (WISE), showing a star-forming cloud teeming with gas, dust and massive newborn stars. WISE, which is surveying the whole sky in infrared light, is particularly sensitive to the warm dust that permeates star-forming clouds like this one. In this way, WISE complements visible-light observations. The mission complements Hubble and other telescopes by showing the ‘big picture,’ providing context for more detailed observations. The cluster contains some of the most massive stars known. Winds and radiation from the stars are evaporating and dispersing the cloud material from which they formed, warming the cold dust and gas surrounding the central nebula. The greenish ‘halo’ of warm cloud material is seen best by WISE due to its large field of view and improved sensitivity over past all-sky infrared surveys.

(Foto: EPA/NASA)