[ceeam]

The ISS is well within the Earth magnetic shield for starters. Almost no radiation, compared to real outer space.

[thejackgoode]

Is that why they sent Scott Kelly for a year up there and then compared him to his twin?

[EasyMark]

didn't they do that to test the effects of being in space for a long time on general health, dna status? See how much bones degrade, if blood chemistry stays the same, etc.