Seven stars orbiting the region identify the invisible object.
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MaillardJ .P., PaumardT., StolovyS. R. & RigautF. Astron. Astrophys., 423. 155 - 167 (2004).
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Institute of Astrophysics in Paris, France
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Peplow, M. Second black hole found at the centre of our Galaxy. Nature (2004). https://doi.org/10.1038/news041108-2