Definition

1. Noun:
   • A space helmet is a protective helmet worn by astronauts during space missions. It is part of the spacesuit and provides a sealed, pressurized environment for the head, supplying breathable air and protecting the wearer from the extreme conditions of outer space, such as vacuum, temperature extremes, and micrometeoroids.

Usage Examples

• Noun:
  • The astronaut secured her space helmet before exiting the spacecraft.
  • A space helmet has a visor to protect the eyes from solar radiation.
  • Modern space helmets are equipped with communication systems and cameras.

Advanced Usage

• "to don/put on a space helmet": to put on or wear a space helmet.
  • The crew must don their space helmets before depressurizing the airlock.
• "sealed space helmet": emphasizes the airtight quality essential for survival.
  • A single crack in a sealed space helmet could be catastrophic.

Variants and Related Words

• Helmet (n): a protective head covering used in various activities (e.g., cycling, construction). A space helmet is a specialized type of helmet.
• Spacesuit (n): the full protective garment worn by astronauts, which includes the space helmet as a critical component.
• Bubble helmet (n): an informal term sometimes used to describe the shape of certain space helmet designs.

Synonyms

• Astronaut helmet: a direct synonym specifying the wearer.
• Pressure helmet: a term highlighting its function of maintaining atmospheric pressure.

Related Phrases

• "Helmet visor": the transparent part of the space helmet that the astronaut looks through.
  • He lowered the sun visor on his space helmet.
• "Helmet-mounted display": a screen or projection inside the helmet providing data.
  • The new space helmet features an advanced helmet-mounted display for navigation.

Related Idioms

(Note: There are no common idioms specifically for "space helmet." It is a technical term. However, it can be used metaphorically.) - "To be in one's own space helmet": (informal, metaphorical) to be isolated or detached from one's surroundings, similar to being in one's own world. - Ever since he started that project, he's been in his own space helmet, barely noticing anything else.

Noun

1. a helmet worn by astronauts while in outer space