In the International Space Station (ISS), astronauts can live and work without space suits in the habitable modules. These modules are specifically designed to provide a safe and comfortable environment for astronauts to conduct experiments, eat, sleep, exercise, and perform other daily activities without the need for protective gear.
Habitable modules such as the Unity module, Harmony module, Tranquility module, and others, contain the necessary life support systems including air circulation, temperature control, and waste management to sustain human life in space. Astronauts can move freely inside these modules wearing regular clothing, as they are shielded from the vacuum of space and are pressurized to maintain a breathable atmosphere.
On the other hand, truss modules, galactic modules, and functional modules primarily serve other purposes such as structural support, equipment storage, power generation, and docking of spacecraft. These sections of the ISS are not designed for long-term human habitation and therefore astronauts would need to wear space suits when working in these areas to protect themselves from the harsh conditions of space.
