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planet
noun
a
large
,
round
object
in
space
that
travels
around
a
star
and
shines
by
reflecting
that
star
’
s
light
•
Scientists
discovered
a
new
planet
orbiting
a
distant
star
.
Scientists
discovered
a
new
planet
orbiting
a
distant
star
.
•
Through
a
telescope
,
the
children
saw
the
rings
of
the
planet
Saturn
.
Through
a
telescope
,
the
children
saw
the
rings
of
the
planet
Saturn
.
From
Old
French
planete
,
from
Latin
planēta
,
from
Ancient
Greek
planḗtēs
“
wanderer
”,
because
planets
appear
to
wander
among
the
fixed
stars
.
noun
-
planet
Earth
,
especially
when
people
talk
about
protecting
the
environment
•
We
all
must
act
now
to
save
the
planet
from
pollution
.
We
all
must
act
now
to
save
the
planet
from
pollution
.
•
Climate
change
threatens
the
health
of
our
planet
.
Climate
change
threatens
the
health
of
our
planet
.
Same
origin
as
the
astronomical
sense
;
modern
environmental
usage
began
in
the
late
20th
century
as
concern
for
the
Earth
’
s
ecosystems
grew
.
