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>> What is sky scientifically <<
Basically: anything "above" a person
from the perspective of that person
that is not part of the surface of the Earth.
So: space, atmosphere, clouds, celestial bodies, etc. are all part of or included in the term "sky".
https://www.dictionary.com/browse/sky
ANDRE L
Science is right.
Quran is wrong.
Go annoy the Religion section.