curvature of spacetime, are expected to diverge at this singularity.

Is such a singularity necessarily surrounded by an invisible region of spacetime, i.e. has a black hole formed? The singularity theorems do not imply so. The singularity may or may not be visible to a far away observer. If the singularity is invisible to a far away observer, we say the star has ended as a black hole. If it is visible, we say the star has ended as a naked singularity. We need to have a better understanding of general relativity in order to decide whether collapse always ends in a black hole or whether naked singularities can sometimes form.

Given this situation, Penrose was led to ask [@pe] whether there might exist a cosmic censor who forbids the existence of naked singularities, ‘clothing each one of them with a horizon’? Later, this led to the cosmic censorship hypothesis, which in broad physical terms states that the generic singularities arising in the gravitational collapse of physically reasonable matter are not naked. Till today, this hypothesis remains unproven in general relativity, neither is it clear that the hypothesis holds true in the theory. What is of course true is that 