MRI's also show an effect on the brain. Motor skills are affected. It might be more difficult to operate calculators/computers once back on earth. Scott Kelly was in space 340 days... moreMRI's also show an effect on the brain. Motor skills are affected. It might be more difficult to operate calculators/computers once back on earth. Scott Kelly was in space 340 days. A very long time. I wonder how long it takes to adjust to gravity once back on earth?