Microgravity's Grip: Developing Bodies Face Unknown Perils in Space

Researchers from the Institute of Biomedical Problems of the Russian Academy of Sciences (IMBP RAS) and international teams are investigating how microgravity and radiation impact developing organisms. Using cell cultures, animal models, and ground-based simulations, the scientists aim to identify risk systems for growing bodies. However, current data remains insufficient to establish a safe flight protocol for children, as most results are derived from models that do not fully replicate real space conditions. The primary biological challenge lies in the fact that a child's body must grow and adapt to its environment simultaneously. While an adult organism adapts already formed systems, a child lacks a terrestrial physiological baseline to return to after a mission. This creates critical risks for the formation of the skeletal system and motor skills. Bone tissue in children is in a state of constant remodeling. In microgravity, the lack of mechanical load can disrupt mineral density, bone geometry, and the function of growth zones—the cartilaginous areas responsible for longitudinal bone growth. Because a child is creating a structure rather than simply recovering mass, a deficit of load during active growth may lead to irreversible changes in skeletal strength.