Tag Archives: NGC

Open Thread Thursday: Sagittarius X-4

From Wikipedia (Sagittarius X-4 Sagittarius X-4 (Sgr X-4) is the designation for an astronomical X-ray source detected by the X-ray observatory satellite Uhuru and given the catalog designation 2U 1820-30.[1] The “2U” stands for the second Uhuru catalog of X-ray … Continue reading

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