The Cosmic Cube is an experimental computer designed to explore highly concurrent computing. It consists of 64 small computers, or nodes, connected by a network of point-to-point communication channels forming a binary 6-cube. Each node runs an operating system kernel that schedules and manages processes, handles system calls for message sending and receiving, and routes messages within the node. The Cosmic Cube uses message-passing instead of shared variables for communication, which simplifies the hardware structure and operating system. This design allows for better scalability and performance in complex applications, making it a promising approach for future supercomputers with thousands of nodes. The machine has been used to run various scientific and engineering computations, demonstrating significant speedup compared to single-node systems. The article also discusses the hardware and software design, programming techniques, and potential future improvements and applications.The Cosmic Cube is an experimental computer designed to explore highly concurrent computing. It consists of 64 small computers, or nodes, connected by a network of point-to-point communication channels forming a binary 6-cube. Each node runs an operating system kernel that schedules and manages processes, handles system calls for message sending and receiving, and routes messages within the node. The Cosmic Cube uses message-passing instead of shared variables for communication, which simplifies the hardware structure and operating system. This design allows for better scalability and performance in complex applications, making it a promising approach for future supercomputers with thousands of nodes. The machine has been used to run various scientific and engineering computations, demonstrating significant speedup compared to single-node systems. The article also discusses the hardware and software design, programming techniques, and potential future improvements and applications.