The ring hypothesis helps explain a series of unusual observations about Chariklo. Between 1997 and 2008, the centaur appeared to get dimmer. It also gradually stopped reflecting wavelengths of light that astronomers associate with ice. After 2008, it brightened again and the ice seemed to reappear. The team now thinks that during that dimmed decade, Chariklo's ice-containing rings moved so their narrow edges faced Earth. They stopped reflecting light as brightly, making the otherwise dark-colored centaur seem duller. Meanwhile, the ice they contained seemed to "disappear" from the surface of the centaur.