Protective headgear worn by astronauts to survive in the harsh environment of space. It provides oxygen, regulates pressure, and shields against extreme temperatures and radiation.

Example

1. The astronaut's space helmet is filled with oxygen to help them breathe in space.
2. The space helmet is equipped with a communication system to allow the astronaut to talk to others.
3. The child pretended to be an astronaut and wore a toy space helmet.