As private citizens express interest in going to space, a late UCSF astronaut may have figured out an important riddle.

Researchers explore how we can make the human body ready for prolonged space flight.

Study raises questions about long-term brain health after extended spaceflights.

Observation of identical twins – one on earth, one in space – advances NASA’s preparations for mission to Mars.

The prospect of commercial space travel means a new set of health considerations for future travelers.