背景星系

在这个天区的精彩长时曝光影像里，还可以看见更遥远的昏暗背景星系。

This impressively deep exposure of the region also reveals faint and even more distant background galaxies .

为了要呈现黯淡遥远的背景星系和彗尾，影像组合了分别以背景恒星和快速移动彗星为导星所拍摄的影像。

To reveal the faint and trace the comet 's fading tail , the remarkable picture is a blended composite of telescopic exposures aligned with the both the stars and the speedy comet .

基于新发现的2&5μm的红外背景和星系前星，我们讨论了各种模型的尘埃对3K宇宙微波背景谱所产生的影响。

Based on the discovery of an IR background in the waveband 2-5 μ m and pregalactic stars , we discuss the effect of the 3K cosmic microwave background spectrum from dusts of various models .

宇宙X射线背景辐射与活动星系核

Cosmic X-Ray Background Radiation and Active Galactic Nuclei