Flying into space is a dream for many — but it also comes with many risks and problems. And staying healthy is one of the key problems. We’ve known for a while that muscle atrophy is a problem for astronauts, but now, researchers have shown that simply being in outer space can make muscles get “older”. But there’s some good news as well: we know the genes responsible for this. Muscle on a chip — now in spaceSkeletal muscle constitutes about 40% of human body weight and plays a crucial role in movement and stability. These muscles are constantly being regenerated, a process primarily driven by …