Cygnus X-3
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Författare/Upphovsman: IAU and Sky & Telescope magazine (Roger Sinnott & Rick Fienberg), Licens: CC BY 4.0
IAU Cygnus chart
Halo around the X-ray source Cygnus X-3. The halo (beyond the yellow ring in the center) is due to scattering of the x-rays by interstellar dust grains along the line of sight to the source. The sharp horizontal line is an instrumental effect.