Some scientists believe that they have stumbled upon the first ever detected rings around a moon. As if that were not interesting enough — these theoretical rings would also be the only rings ever found around a body that is not a gas giant such as Saturn, Jupiter, Uranus or Neptune. As a matter of fact, Rhea isn’t even one of the larger moons of the Solar System. If these rings exist they are sparse and made of small particles, so Cassini is unlikely to ever detect these particles with the cameras its is equipped with. Therefore, there are no actual images to support this theory… but it is interesting enough that I feel compelled to at least point interested space fans to a great article explaining the theory on the Planetary Society’s blog.