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This is a false colour composite image of an object called RCW120. An expanding bubble of ionised gas, about ten light-years across, causes the surrounding material to collapse into dense clumps where new stars are formed. The blue colours represent the intensity of sub-millimetre emission, not visible to our eyes; the reddish glow comes from ionised gas.

CREDIT: ESO/APEX/DSS2/ SuperCosmos/ Deharveng(LAM)/ Zavagno(LAM).

Source:
http://www.eso.org/public/images/eso0840a/