Spitzer's IR instruments can capture the heat radiation put off by dust particles in the ring, which starts some 3.7 million miles from Saturn and extends outward another 7.4 million miles.
斯皮策望远镜上的红外线设备可以俘获环尘埃发出的热辐射，这个巨大的环内侧距离土星600万公里，向外一直扩展到1800万公里处。
Its particles are diffuse and may even extend beyond the bulk of the ring material all the way in to Saturn and all the way out to interplanetary space.
光环微粒是如此的弥散以致于它们从土星一直延伸到行星间空间。
The relatively small Numbers of particles in the ring wouldn't reflect much visible light, especially out at Saturn where sunlight is weak.
人数较少的粒子环，并不反映多少可见光，特别是已在土星在阳光薄弱。
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