Are there any fields that merges health and space science? Currently, I am an undergraduate majoring in biophysics and minoring in astrophysics. I've always had a deep passion for learning about the universe (especially the field of astrobiology) and I also have strong interests in "applied" biophysics. 

Initially, I wanted to pursue higher education to do research in either astrophysics or astrobiology. After spending time in both physics and biology research, however, I realized that research was not what I am most passionate to pursue and I could not find a calling in that career, although I enjoy the subjects very much.

However, through my experience in research, I was introduced to and developed an interest in the field of medicine because of many reasons, but especially because it provides me an opportunity to apply my biophysics passion to work on "practical" things such as creating new medical technology. 

My problem is that pursuing further studies towards medicine by going to medical school would almost completely isolate my passion for space. So, currently I am at a crossroad and do not know where to pursue my higher education.

I can't find much information on how I could possibly continue to pursue both passions, which is why I am writing to ask if anyone has any ideas if there are any fields or directions that would still allow me merge my two interests (medicine and astrobiology)?
Neither of these fields is my area, so I'll mention an orthogonal path: you could become an expert in something else (e.g., statistics, game theory, programming -- right now the hot thing is machine learning / deep learning, but who know where we'll be in 10+ years), then you can apply that toolkit to both space programs and biomedical programs (whether through a university or through scientific consulting). Of course, it's an uncertain path, particularly if there is no "something else" that you are also passionate about.