The center of our galaxy constitutes an extreme environment, and not only because of Sagittarius A *, the central supermassive black hole, but also because the density of stars in the central region can reach ten million times that of the solar neighborhood. An international group of astronomers, in which the Institute of Astrophysics of Andalusia (IAA-CSIC) (Spain) participates, has presented its results on a strange group of objects that seem to be halfway between the stars and the gas clouds .

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