(CNN)– NASA is looking for volunteers willing to lie in bed for 70 days.

That’s it – just lie there. They’ll pay you about $18,000.

But you can’t get up. You can read books, play on the computer, watch TV, even work – but you have to stay on that bed. Lying down.

The purpose of the study is to research the effects of long-term spaceflight, the kind where you’re strapped in for weeks, on the human body.