Westerlund 2

　　Westerlund 2 — Hubble’s 25th anniversary image

                               
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　　This NASA/ESA Hubble Space Telescope image of the cluster Westerlund 2 and its surroundings has been released to celebrate Hubble’s 25th year in orbit and a quarter of a century of new discoveries， stunning images and outstanding science.
　　The image’s central region， containing the star cluster， blends visible-light data taken by the Advanced Camera for Surveys and near-infrared exposures taken by the Wide Field Camera 3. The surrounding region is composed of visible-light observations taken by the Advanced Camera for Surveys.
　　Credit:
　　NASA， ESA， the Hubble Heritage Team (STScI/AURA)， A. Nota (ESA/STScI)， and the Westerlund 2 Science Team
　　The original observations of Westerlund 2 were obtained by the science team: Antonella Nota (ESA/STScI)， Elena Sabbi (STScI)， Eva Grebel and Peter Zeidler (Astronomisches Rechen-Institut Heidelberg)， Monica Tosi (INAF， Osservatorio Astronomico di Bologna)， Alceste Bonanos (National Observatory of Athens， Astronomical Institute)， Carol Christian (STScI/AURA) and Selma de Mink (University of Amsterdam). Follow-up observations were made by the Hubble Heritage team: Zoltan Levay (STScI)， Max Mutchler， Jennifer Mack， Lisa Frattare， Shelly Meyett， Mario Livio， Carol Christian (STScI/AURA)， and Keith Noll (NASA/GSFC).