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The vertical dimension represents time, the horizontal dimension space. If you take a horizontal cross-section of the diagram it shows the position of the surface of the star and of the event horizon at a given time--you can see that the radius of the star steadily shrinks and the radius of the event horizon grows from the point in space and time labeled "O", until the event horizon reaches a fixed radius at the moment the collapsing star is fully inside it. The representation of the singularity as a wavy line is just a visual convention, don't take it literally.Sir that is my basic problem.I ve got this image and now i am unable to understand it,Event horizin is considered as the radius of the black hole this is the point i got from the wekipedia site and in this image it is quite difficult to understand where is the collapsing star from where it is looking like the symmetric collapse?and the most confusing thing present here is the representation of the singularity as a wave form.... the co ordinates also hav nt shown here, Can u help me find out its complete discription?