outer space

"Outer space" refers to the vast, largely empty regions beyond Earth's atmosphere, encompassing all celestial bodies and the vacuum between them.

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Definition

B2General

(common)The vast expanse beyond Earth's atmosphere where stars, planets, and other celestial objects exist.

Example

  • Astronauts train extensively before venturing into outer space.
  • Telescopes allow us to observe distant galaxies in outer space.

C1Science

(technical)The region beyond Earth's atmosphere characterized by a near-perfect vacuum, extreme temperatures, and various forms of radiation.

Example

  • Outer space poses unique challenges due to its vacuum and radiation.
  • Scientific missions continue to explore the mysteries of outer space.

C1Space Exploration

(technical)The area starting from the Kármán line, about 100 km above sea level, extending to infinity.

Example

  • The International Space Station orbits within the lower regions of outer space.
  • Many space treaties define outer space starting from the Kármán line.

Similar

Terms that have similar or relatively close meanings to "outer space":

deep spacenear spacedark spaceempty spacefree spacespace flightlittle spacespace agespace outoutside worldspaced outhalf spacedanger spacewhite spacepersonal spacefactor spacespace technologyopen seathird spacespace cadetspace operathin space