Is space travel bad for the heart? What happens to hemodynamics in microgravity? Does living in outer space age the heart prematurely? How much time in space is too much time? And how deep in space is too deep? These are all questions that have been considered as we explore the world beyond planet Earth and spend progressively longer periods in near and deep space. In this article, Cardiology reviews the data and speaks to expert "space cardiologists" to summarize our current understanding of the impact of space travel on the heart. Read more. Follow Cardiology on Twitter using #CardiologyMag and get the full issue here.