____________________
is
a
very
old
____________________
.
It
is
the
study
of
the
stars
,
the
sun
and
the
planets
.
With
a
naked
eye
,
you
can
only
see
some
bright
____________________
in
the
night
____________________
,
but
with
a
____________________
,
you
can
see
a
lot
more
.
Our
____________________
system
includes
the
sun
and
the
eight
____________________
.
Our
planet
____________________
,
goes
around
the
sun
like
all
the
other
planets
.
The
____________________
goes
around
our
planet
.
The
milky
way
,
our
____________________
,
has
got
at
least
200
billion
stars
and
lots
of
solar
____________________
.
