Abstract: A spacecraft for the distribution of electrical energy to client craft at points situated in free space, in orbit and/or on a celestial body includes a main structure equipped with an electric thruster, with a chemical thruster and with a solar generator, a first fuel container for fuel intended for the electric thruster, and a second fuel container for fuel intended for the chemical thruster. The spacecraft is able to be modulated such that the main structure can be coupled/decoupled alternatively to/from the first container or the second container, the first container and the second container are able to be coupled/decoupled to/from one another, and the solar generator can be deployed or retracted.

Abstract: A method and system for optimizing the time required to download objects from an Object Carousel used in a DVB system is provided. The method comprises ensuring that all the directory object representations are located in a subset of modules on the Data Carousel. This means that after one file object has been downloaded, most, if not all of the directory information of the virtual file system will have been resolved so that only a single module needs to be downloaded to access any further file objects.