EXOSPHERE

Pronunciation (US):

(GB):

 Dictionary entry overview: What does exosphere mean? 

• EXOSPHERE (noun)
  The noun EXOSPHERE has 1 sense:

1. the outermost atmospheric layer

  Familiarity information: EXOSPHERE used as a noun is very rare.

 Dictionary entry details 

• EXOSPHERE (noun)

Sense 1

Meaning:

The outermost atmospheric layer

Classified under:

Nouns denoting natural objects (not man-made)

Hypernyms ("exosphere" is a kind of...):

layer (a relatively thin sheetlike expanse or region lying over or under another)

Holonyms ("exosphere" is a part of...):

atmosphere (the envelope of gases surrounding any celestial body)

 Context examples 

The original goal of the team's observing proposal was to determine whether Europa has a thin, extended atmosphere, or exosphere.

(Possible Water Plumes on Jupiter's Moon Europa, NASA)

When a stream of meteoroids rains down on the lunar surface, the liberated water will enter the exosphere and spread through it.

(Meteoroid Strikes Eject Precious Water From Moon, NASA)

From the measurements of water in the exosphere, the researchers calculated that the hydrated layer has a water concentration of about 200 to 500 parts per million, or about 0.02 to 0.05 percent by weight.

(Meteoroid Strikes Eject Precious Water From Moon, NASA)