The statistical circuit includes a pulse-width measuring unit, serially coupling delay units, a logical circuit and counters. The system is a modular, extensible system that supports science operations among multiple, distributed spacecraft by implementing the essential functions of navigation, communication and control. The mold includes a top surface that defines an opening for receiving a liquid fluid. A groove is made on one side of the block. The heat exchanger plates include an outermost heat exchanger plate at one side of the plate package and an outermost heat exchanger plate at an opposite side of the plate package.