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