Padmanabhan, T.2012-03-032012-03-031987-01-12http://hdl.handle.net/11007/213Using simple arguments from general relativity and quantum theory we show that it is not possible to devise experiments (or operational procedures) which will measure the position of a particle to an accuracy better than the Planck length (Gh/c3) = cm. It is also impossible to synchronise clocks to a precision better than Planck time. The implications of the result are discussed.enSpacetime eventsQuantum gravityGeneral relativityQuantum theoryArticle