Explanation: This wide, detailed Spitzer Space Telescope view features infrared light from dust (red) and old stars (blue) in Andromeda, a massive spiral galaxy a mere 2.5 million light-years away.

• 说明： 这张详细的斯皮策太空望远镜长焦图像描绘了来自仙女座中尘埃（红色）和年老恒星（蓝色）放射出的红外光，仙女座是一个质量巨大的旋涡星系，距离我们仅仅250万光年。