Apologies if these questions have been answered before - I didn't have any luck with google. Something has bugged me for a while about quantum experiments like Schrödinger's cat where a 'black box' system is theorised to be in a superposition of states until observation causes wave function collapse - how does this explain the fact that a system can be observed by looking at its 'gravitational signature'? i.e. A dead cat lying down will have a weaker gravitational field than a live cat standing up to an observer above the box. I know the actual cat experiment isn't the best example as the superposition conclusion was rejected (right?) but this extends to single particles too...hypothetically, isn't information on the position carried by the particle's 'gravitational signature'. Secondly...is there a limit on the strength (or rather, weakness) of the gravitational field? i.e. is field strength discrete and thus is there a point when the gravitational field strength due to an object can be said to be actually zero, or is it 'continuous' and decays over an infinite distance but never reaches zero, as the inverse square formula implies? If it is continuous rather than discrete, then would I be right to say that positional changes in even a single atom would technically be 'visible' to all observers anywhere in the universe (allowing for propagation speed of gravity). And, if so, how could anything ever be in a superposition of states?