Changes

[[Image:Dione crescent.jpg|thumb|800px|center|Crescent phase of Dione against the Sun, taken by Cassini]]

[[Image:Dione crescent.jpg|thumb|800px|center|Crescent phase of Dione against the Sun, taken by Cassini]]

== Problems for uniformitarian theories posed by Dione ==

== Problems for uniformitarian theories posed by Dione ==

The greater concentration of impact craters on the trailing hemisphere defies the usual model for the bombardment of a body in tidal lock. Most astronomers therefore suggests that multiple impacts could have turned Dione about, perhaps multiple times, before Dione settled into its present orientation. But any object having enough momentum to turn the satellite about ought to have left it in a far more eccentric orbit than it is now in.

The greater concentration of impact craters on the trailing hemisphere defies the usual model for the bombardment of a body in [[tidal lock]]. Most astronomers therefore suggests that multiple impacts could have turned Dione about, perhaps multiple times, before Dione settled into its present orientation. But any object having enough momentum to turn the satellite about ought to have left it in a far more eccentric orbit than it is now in.

== Observation and Exploration ==

== Observation and Exploration ==