When physical objects can be hurled across the unbridgeable gulf between galactic clusters, at some speed much greater than light.
For example: is it located in this galactic cluster?
His astronomy research focused on a young galactic cluster designated NGC 2264.
Its small radius-of about 2.1 pc-is typical for the galactic globular clusters.
Their disappearance had not enabled more progressive cultures to arise; it had allowed inferior ones to take over the galactic cluster.
Astronomers were reporting "great walls" of galactic clusters too large, it seemed, to have been formed by cold dark matter in the allotted time.
On the whole though, galactic clusters tend to move relatively randomly.
Acceleration may make everywhere inaccessible beyond the local galactic cluster.
Apparently outside galactic cluster, in dust cloud.
The Hyades site was the best-preserved one yet discovered in the galactic cluster.