Sometime after 2004, the two Guardian flights were split into the Galaxy module and larger Sundancer module, each testing progressively advanced systems. This Galaxy had twice the interior volume of the Genesis craft: .
At some point in time after 2004, the two Guardian aircraft underwent a reorganization, resulting in the creation of the Galaxy module and a more extensive Sundancer module, both of which tested progressively advanced systems. The Galaxy had twice the interior space of the Genesis craft: .