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Space photos of the day 06/25

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This artist's impression shows the Cygnus X-1 binary star system, one of the brightest X-ray sources in the sky. Data suggest that there is a small, very dense object about nine times the mass of the sun in this star system. The object could be a black hole, but, strangely, it appears to have formed without a supernova.

PHOTO: ESA/NASA

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