In vivo hemodynamic monitoring using aNIRS during parabolic flight. Wearing NINscan, the subject went through six parabolas simulating the gravity on Mars, six parabolas simulating Lunar gravity, and four parabolas simulating spaceflight. The systemic and cerebral hemodynamics were monitoring continuously during the flight, together with simultaneous re-registered acceleration, respiration and ECG. [The authors have written permission to show the participant's face.]