This book focuses on the limitations of existing technology and the creation of new technologies which are utilized for space missions. Various experts have contributed in the attempt to create a connection between current limitations and advancing technology to facilitate the field's progress. It consists of information regarding methods to calculate the orbit which is based on researches in the field of astrophysics. This book also gives a comprehensive summary of spacecraft systems inclusive of the reliability of inexpensive AOCs, sliding mode controlling, and a novel view on attitude controller design based on sliding mode, with thrusters. Technological instructions for the optimization of HVAC are also discussed. Finally, this book provides a complete analysis of the attempt to resolve problems regarding space missions with the correlation of current technologies and novel developments. Hence, this book intends to give a comprehensive synopsis of the growth of technology in spacecraft systems.