Beskrivning : This module DOS 7 formed the core of the Mir space station complex. The core module has a mass of ~21 tons, a length of about 13.1 m, and a maximum diameter of 4.2 m. It consists primarily of a passage area with five docking ports, a working area housing the command station, living/eating and hygiene facilities, and a propulsion section through which a tunnel allows access to the Kvant module.