space equivalent zone

noun

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.

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Meanings

nounspace equivalent zone (uncountable)
  1. uncountableaeronauticsThe 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.
Cite this entry
APA

space equivalent zone. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/space%20equivalent%20zone

MLA

“space equivalent zone.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/space%20equivalent%20zone. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “space equivalent zone,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/space%20equivalent%20zone.

Source: space equivalent zone on Wiktionary, CC BY-SA 4.0.