Both options are grammatically correct and convey the same meaning. The choice between these two options is largely a matter of personal preference or style.
Yeah I’m not super one-side-or-the other but I probably fall on just keeping the original. Gravity acts on matter according to its mass, not on ‘objects’ per se.
Additionally, ‘attraction’ probably more appropriate than ‘pull’.
Ultimately neither here nor there, but I think not a demonstrable improvement on the card.