To make a sustainable space base, humans are needed to build a sustainable agricultural system in the outer space. And to make this real, some studies and practices are taking place. The practices by the Lunar Farming Concept Studying Working Group from Japan are exactly the one of those. Its report of 2019 shows us that some agricultural plants are selected for space farming; rice plants, soy beans, potatoes, sweet potatoes, tomatoes, strawberries, cucumbers, lettuces and the others (mustard spinaches, for example). Compared to the earthy agriculture, there are less atmospheric pressure, less gravity, but more direct rays. Therefore, we are facing some important issues to overcome. And the study ...