A new assessment of the blood clot published Thursday in the New England Journal of MedicineSix of the astronauts experienced stagnant or reverse blood flow, one had a blood clot and another was found to have a potential partial blood clot. Two months into a six-month mission, an ultrasound of one of the astronaut's veins revealed a blood clot. Moll is a member of UNC's Blood Research Center and is a blood clot expert. Blood flow was induced after 47 days through the vein, but actual spontaneous blood flow was not achieved even after 90 days of treatment. But stagnant blood flow and the blood clot made NASA aware of this potential risk, especially when considering future long duration missions to the moon or Mars.

Source: CNN January 03, 2020 22:18 UTC