Space is defined as three-dimensional, continuous expanse extending in all directions and containing all matter; variously thought of as boundless or indeterminately finite. The term matter is defined as a thing that has mass and occupies space. The building blocks of physical matter are described as atoms and the building blocks of life are described as cells. The structures called atoms and cells always require the dimension called space. As far as living things are concerned, they define their existence by separating from space that surrounds them as they need to constantly define and defend the boundaries of their identity called ‘SELF’ and prevent intrusion or invasion by ‘Non-Self’. Living things need ‘Living Space’. To some extent, the same rule may govern identity of celestial bodies for they need to maintain their originality taking advantage of ‘Space’ that surrounds them. They always exist in relationship with dimension called space. It is a dimension which the man finds difficult to manipulate. For example, I have no ability to create a miniature Solar System; I can easily manipulate the size of celestial bodies to make a miniature Solar System, but the problem comes with creating enough Space to hold the System together. As we explore ‘Outer Space’, man has to come to a better understanding of Living Space he needs to keep his existence.