This has showed that they are amazingly active, changing a lot over only a few years: Fraternité and Égalité have been exchanging material and changing their lengths noticeably. Even more dramatically, Liberté appears to be fading away, being only 30% of its original 1989 brightness in 2003, and hardly visible in Hubble Space Telescope images from June 2005. In the meantime, it seems to have a split two-humped profile, and is now several degrees closer to the more stable Égalité. Courage, a very small and dim arc during the Voyager flyby, was seen to flare in brightness in 1998, while more recently it was back to its usual dimness but had advanced by an additional 8° ahead of the other arcs. That is, it appears to have jumped over to the next stable corotation resonance position. There were also some suggestions that the ring arcs may have been normally fading away. Visible light observations show that the total amount of material in the arcs has remained about the same, but they are dimmer in the infra-red where previous observations were taken. This activity of the ring arcs is not currently understood.
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