Last Updated：2025/12/04
(aviation) 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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space equivalent zone
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Source Word
space equivalent zone
Noun
uncountable
(aviation)
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.
Japanese Meaning
（航空用語）地球の大気上層部、具体的には50,000フィート（成層圏の開始点）から1000マイル（外気圏の端）にかけての領域で、環境にさらされた際の人体への影響が宇宙空間に近い領域
Sense（1）
(aviation)
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.
