Starbirth region RCW 49, infrared Spitzer Space Telescope (SST) image. The SST's infrared imaging sees past clouds of dust to newborn stars inside active nebulae. These stars (blue) are scattered throughout the nebula, though a dense cluster is seen at centre. The gas (green) and dust (pink) of the nebula is being blown outwards by radiation from the young stars. RCW 49 contains over 2200 stars, a

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