... Science User Portal . ... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... ESO Acronyms . ... Survey Telescopes . ... Star Clusters . ... Stars@ESO . ... Observations at many sites in South America, including ESOтАЩs La Silla Observatory, have made the surprise discovery that the remote asteroid Chariklo is surrounded by two dense and narrow rings. ... This artistтАЩs impression shows how the rings might look from close to the surface of Chariklo. ...