From osteoporosis to Alzheimer’s: the bodies of astronauts on the Space Station become laboratories

“They are not super-humans” Guillaume Weerts winks. She is talking about the astronauts and, taking the role of the reassuring doctor, patiently explains: “In reality they do not make any significant difference with all of us. Otherwise we would not study their biology.”

600 in space, 18 on the moon

Here on Earth, we are crowded with almost 8 billion individuals, while just over 600 have leapt beyond the atmosphere, reaching an Earth orbit.