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Meaning of space equivalent zone | Babel Free

Noun CEFR C1

Definitions

The top of the Earth's atmosphere, from 50,000 ft (the start of the stratosphere) and up (to the edge of the exosphere at 1000 mi); where the effects of exposure to the environment on human life is similar to that of exposure to space; it being physiologically incompatible with human life.

uncountable

CEFR level

C1
Advanced
This word is part of the CEFR C1 vocabulary — advanced level.
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See also

space exploration space factor space fixed reference space flight space force space frame

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