# Do astronauts also have a lack of certain radiation which they had on Earth but not in space?

You could think perhaps about sunlight. But a while ago I've read something about astronauts missing some other 'strange' radiation. I forgot what is exactly was. But could it be for example a kind of radiation of the magnetic field of the earth or perhaps a kind of radiation/vibrations of the earth. I thought they really needed that kind of radiation and therefor it was mechanically simulated in their (Russian?) spaceship.

• "Z-rays ..is two better than X" – Andrew Thompson Jul 3 '16 at 0:31