Another form of exospheric; relating to the exosphere with emphasis on its spherical nature and characteristics.
Exosphere + -ical (variant suffix forming adjectives, from Greek -ikos + -al). A less common variant than 'exospheric,' used primarily in technical scientific writing for stylistic variety.
Scientists sometimes use both 'exospheric' and 'exospherical' almost interchangeably, but 'exospherical' emphasizes that we're talking about a three-dimensional shell around the entire planet rather than just surface conditions.
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