NOAO / AURA / NSF / SCIENCE PHOTO LIBRARY NOAO / AURA / NSF / SCIENCE PHOTO LIBRARY
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Trifid nebula (M20). The nebula is a stellar nursery. The pink region glows as radiation from the hot young stars born within it ionises the hydrogen gas there. The blue region is a reflection nebula, which does not emit its own light but reflects the light of nearby stars.
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