the blood of astronauts circulates badly, and it is a big problem

Astronauts are real guinea pigs for scientists, who conduct a large number of experiments, particularly on their health.

Astronauts orbiting the Earth in the International Space Station are incredible guinea pigs for science, which can study the effects of the absence of gravity on the human body. And therefore, de facto, the effects of gravity on our organism.

If we already know that our muscles and bones were designed to live under atmospheric pressure and a precise force of gravity, nothing tells us how our blood, in our veins, will react to it in the absence of gravity.

This question, NASA researchers have asked themselves. They sought to understand how our blood system reacts in the vacuum of space. According to the American space agency, the body of the astronauts having no external force of gravity against which to fight it then becomes “crazy”.

Lack of gravity wreaks havoc on our bodies

As NASA explains, on Earth blood is naturally pushed to the abdomen and legs. But in the weightlessness of the international space station, things are very different. Indeed, the blood is naturally pushed by our body to the top of the latter.

The head and torso are thus supercharged, unlike the legs which are the part of the body most left by this lack of gravity. This phenomenon, known since the first space flights, has been extensively studied by NASA and other space agencies around the world.

The latter are thus seeking to find a solution so that the human body can adapt. Because the risks for astronauts are very real. According to NASA, excess blood in the head can create hearing loss (occasional or even permanent), but also an increase in brain pressure, which will lead, among other things, to eye deformation.

Lack of gravity can also cause accelerated muscle deterioration, which will even affect the heart for long duration flights in space.

A problem that could prevent flights to Mars

Faced with all these questions, NASA must find answers. She who plans to send men and women to the Moon in a few years, but also, Men (with a capital H) to Mars before 2040.

But to get to the red planet, a manned flight would take more than three years, so we will have to know the mechanics in place in our body at our fingertips so as not to see the health of astronauts deteriorate at full speed, at millions of miles from Earth.

NASA is working today with ESA and JAXA (among other things) to understand more and more about our human body and how it reacts in space. These biomedical experiments filled the schedule of astronauts, including Thomas Pesquet, who carried out many of them during his last stay on the ISS.

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