Composition
of
the
____________________
system
.
Located
at
the
____________________
of
the
solar
system
and
influencing
the
motion
of
all
the
other
bodies
through
its
gravitational
force
is
the
____________________
,
which
in
itself
contains
more
than
99
percent
of
the
mass
of
the
____________________
.
The
planets
,
in
order
of
their
____________________
outward
from
the
Sun
,
are
Mercury
,
Venus
,
Earth
,
Mars
,
Jupiter
,
____________________
,
Uranus
,
and
Neptune
.
Four
planets
?
Jupiter
through
Neptune
?
have
ring
systems
,
and
all
but
Mercury
and
Venus
have
one
or
more
moons
.
Pluto
had
been
officially
____________________
among
the
planets
since
it
was
____________________
in
1930
orbiting
beyond
Neptune
,
but
in
1992
an
icy
object
was
discovered
still
farther
from
the
Sun
than
Pluto
.
Many
other
such
discoveries
followed
,
including
an
object
named
Eris
that
____________________
to
be
at
least
as
large
as
Pluto
.
It
became
apparent
that
Pluto
was
simply
one
of
the
____________________
members
of
this
new
group
of
objects
,
collectively
known
as
the
Kuiper
belt
.
Accordingly
,
in
August
____________________
the
International
Astronomical
Union
(
IAU
)
,
the
organization
charged
by
the
scientific
community
with
classifying
astronomical
objects
,
voted
to
revoke
Pluto
?
s
planetary
status
and
place
it
under
a
new
____________________
called
dwarf
planet
.
For
a
discussion
of
that
action
and
of
the
definition
of
planet
____________________
by
the
IAU
,
see
planet
.
