Space is most definitely natural. It has existed for literally billions of years before not only human beings but life in general.
Everything that exists anywhere, including outer space, qualifies as "nature".
facts
Rochelle Newman has written: 'Space, structure, and form' -- subject(s): Art, Mathematics, Nature (Aesthetics), Nature(Aesthetics), Space (Art) 'Malleable Matter/Stretchable Space'
The Nature of Space and Time - 2008 was released on: USA: 31 October 2008 (Savannah Film and Video Festival)
the theory of relativity and the curved nature of space
what about Fire ? It occupies in a space, right ? Does it have mass? I think the plasma state materials.
the theory of relativity and the curved nature of space
Due to their unidentified nature it is impossible to tell their origin.
A green space is somewhere that has plants and grass and is mostly green because most nature plants are green.
A vacuum is a space that has nothing in it. Instances of vacuums do not normally occur in nature, but can be produced in a lab.
nature
One will "push" the other out of the space that they are competing in.