Celestia Forums

Many thanks for the pointer I found some interesting papers there.

This one answered my question in rather nicely:
Lithopanspermia in Star Forming Clusters

Fascinating ...

Firstly, is there a limit on how dense open clusters can get? I've heard globulars have been known to be a couple of stars per cubic ly. Could an open cluster get that dense? Gravitational disturbances from passing stars would affect planetary formation, however what else in the cluster might affect...