Space is harder to makw look "right" because, as Alex notes, ther'e sno atmosphere, which we need fo rour normal references!
it's why folk moon landing pics were faked, when they aren't.

Very little ambient light (no atmosphere to scatter)
Shadows are very harsh (again no spthmosphere to scatter or many objects to reflect light)
No alteration of the SUn's colour by the atmosphere (So no blue sky dome effect, or red sunset)

alway smake things at real scale values, this helps

also you cna use Z depth or depth blur in render to add depth.
:)

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