While it's clear that we don't really know everything about how gravity works (our fundamental theory of gravity is inconsistent with our fundamental theories of other forces), if you were asked on a physics test whether gravity pushes or pulls, I think the answer would be simply that it attracts (so I would say "pulls"). Absent any other pushes or pulls, two objects with mass will accelerate towards each other by Gm1m2/r^2 - whether you would call that a push or a pull is a bit of a symantics issue (my preference would be for pull). This is the Newtonian point of view, and from this point of view there really is nothing more to gravity than the force specified by the above law, why it happens or if there's some sort of medium that transfers the force (instantaneously in Newton's theory) are questions that are not addressed by Newton's theory of gravity. In Einstein's theory of gravity, gravity is not a force so it neither pushes nor pulls. Instead, energy(mass)/momentum cause space to be curved. Absent any forces (not gravity) objects will travel on the straightest possible line that they can through space/time, which to many observers will appear to be curved. That of course is not a very good explanation of Einstein's theory (so don't feel dumb if it didn't make much sense <img src="/images/icons/smile.gif" />), to really explain the theory in a way that makes sense I think requires a lot of math/physics which you can learn over time if you wanted, but suffice it to say that I think gravity neither pushes nor pulls from Einstein's point of view. <br /><br />Some other posters made reference to the bounce at the core of a supernova. I could be wrong, but as I understand it, the bounce itself is caused by processes other than gravity. (If I remember right, the current theory is that a sound wave causes the star to bounce back in supernova - that would mean electromagnetic forces are responsible for the bounce). While there are some experiments that might be interpre <div class="Discussion_UserSignature"> </div>