23.11.11
Astronomy
is a
natural science
that deals with the study of
celestial objects
(such as
stars
,
planets
,
comets
,
nebulae
,
star clusters
and
galaxies
) and
phenomena
that originate outside the
atmosphere of Earth
(such as the
cosmic background radiation
). It is concerned with the evolution,
physics
,
chemistry
,
meteorology
, and
motion
of celestial objects, as well as the
formation and development of the universe
.
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