From http://en.wikipedia.org/wiki/Globular_cluster http://en.wikipedia.org/wiki/Globular_cluster : "However, they are not thought to be favorable locations for

From http://en.wikipedia.org/wiki/Globular_cluster http://en.wikipedia.org/wiki/Globular_cluster : "However, they are not thought to be favorable locations for the survival of planetary systems. Planetary orbits are dynamically unstable within the cores of dense clusters because of the perturbations of passing stars."