Hubble catches stars on the move: Surprising signs of unrest in massive star cluster

By exploiting the exquisite image quality of the NASA/ESA Hubble Space Telescope and comparing two observations made 10 years apart astronomers have, for the first time, managed to measure the tiny motions of several hundred young stars within the central cluster of the star-forming region NGC 3603. The team was surprised to find that the stars are moving in ways that are at odds with the current understanding of how such clusters evolve.

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