Delta-class planet

The wreckage of Starbuck's Viper after crash-landing near a marsh on the Delta-class planet Attila ^{(TOS: "The Young Lords")}.

A Delta-class planet is a term used to describe a type of planet capable of human habitation.

Delta-class planets like Attila are typically swamp-like and have high levels of humidity causing oxidation of the metals used by Cylons, including their Centurions ^{(TOS: "The Young Lords")}.