The purple emission is multi-million degree gas detected in X-rays by NASA's Chandra X-ray Observatory and the other colors show galaxies in an optical image from the Sloan Digital Sky Survey.

其中紫色喷发状物质是几百万度高温的气体，由Chandra X射线天文中心探测；其他颜色展示了斯隆数字星空调查的光学图片中的一些星系。

youdao

Todd Boroson and Tod Lauer of the US National Optical Astronomy Observatory analysed some 17, 500 spectra from the Sloan Digital Sky Survey, and have now found just such a pair of emissions coming from a distant quasar.

BBC: Dancing black hole twins spotted