From CSTART Wiki
 Project Overview
The goal of the COSMoS (CSTART Open Source Modular Satellite) program is the design and construction of a family of picosatellites and nanosatellites based on the CubeSat 1U, 2U and 3U specifications. The satellites will provide robust solutions to the core functions of satellites, such as power generation and storage, orientation and radio communication, and will be designed so that purpose-specific modules can be attached to this infrastructure and receive power and pass arbitrary data to the communication channels, permitting the use of a common infrastructure for a wide range of scientific applications. The idea is that the most appropriate satellite for a given purpose can be built by combining standard “building blocks”.