Gravity
is
a
non
-
contact
____________________
.
All
masses
have
gravity
.
It
is
a
force
that
____________________
towards
their
____________________
.
In
our
planets
,
the
____________________
,
there
is
gravity
for
this
reason
we
don´t
____________________
away
.
In
the
____________________
there
isn´t
____________________
.
Sir
Isaac
____________________
was
a
scientis
that
discovered
____________________
over
300
years
ago
.
