This question already has an answer here:

I'm wondering why artificial gravity is not included on the ISS, or on the currently planned OPSEK.

There are long-term health effects of weightlessness, which would be avoided, using artificial gravity based on centripetal force.


merged by kim holder Jul 2 '16 at 14:33

This question was merged with Why are there no spacecraft rotating for artificial gravity? because it is an exact duplicate of that question.