关于这张图
From just outside the faint edge of Saturn's F ring, the moon Pandora keeps watch over her fine-grained flock. The outer flanks of the F ring region are populated by ice particles approaching the size of the particles comprising smoke. As a shepherd moon, Pandora helps her cohort Prometheus confine and shape the main F ring. Pandora is 84 kilometers (52 miles) across. Prometheus is 102 kilometers (63 miles) wide and orbits interior to the F ring. The small knot seen attached to the core is one of several that Cassini scientists are eyeing as they attempt to distinguish embedded moons from tr…
