Essentially, there are two basic categories of spacecraft, inter-solar system spacecraft and extra-solar spacecraft. The difference between the two categories of spacecraft lies in the movements of inter-solar spacecraft within our solar system only, and the movements of extra-solar spacecraft between our solar system and other stars. This article does not discuss spacecraft in the extra-solar system, because the technology for traveling from our Sun to other stars in our galaxy and back has not even reached the infancy stage. There are seven basic characteristics and four basic classes for inter-solar system spacecraft. [Ref. 5]. The seven fundamental characteristics are:1. Consists of a bus compartment and one or more payload compartments. (See Figure 1)2. Is certified to be maneuverable in space.3. Is certified to respond to manual, remote or robotic commands and controls.4. Is certified to survive the space environment.5. Is certified to meet all space mission requirements.6. Is certified to meet all operational safety requirements.7. Is certified to meet all functional and physical design requirements.BenefitsPlug and Play open source spacecraft architecture designs consist of hundreds of drawings available to anyone. These drawings are grouped into what is called a Critical Design Review (CDR) [Ref. 6] package. Some parts and equipment of a spacecraft architecture design can be purchased "off the shelf," so to speak, from commercial suppliers of parts and equipment. Commercial off the shelf (COTS) [Ref. 7] Parts and equipment are cheaper because they are already manufactured and you just have to deliver them.” The more COTS in a spacecraft, the better, because it means there will be more hardware here... middle of paper ......Russia, China, Japan and Brazil really wanted to improve the standard of living of their citizens so one way to do this would be to exempt their engineers from export control regulations while they participate in international working groups on space systems.Summary/ConclusionL The advantage of plug and play open source spacecraft is that they cost much less than spacecraft built using proprietary designs. because several companies are authorized to build them at the same time. As with kitchen appliances, the more spaceships built at once, the cheaper each one will cost. However, just like commercial kitchen appliances, commercial spacecraft must be consistently safe and reliable when in use. Otherwise, potential customers won't buy them. In the case of spacecraft, this consistently means that they are all of the same high quality level..