It consists of a main globular cluster in the centre and a younger, smaller cluster, seen below and to the right, composed of extremely hot, blue stars and fainter, red T-Tauri stars. This wide variety of stars allows a thorough study of star formation processes.
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Full story at http://spacefellowship.com/news/art17585/picture-of-the-day-remarkable-sparkling-double-cluster.html
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