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Relays are enormous structures, sporadically located throughout
the Milky Way, that create corridors of virtually mass-free
transit zones between star clusters in the Mass Effect universe.
This raises the effective speed of light, allowing starships to
travel at incredibly high velocities without relativistic
effects. Mass relays are the most powerful mass effect engines
in existence, enabling travel at speeds far greater than
conventional FTL drives; distances that would take millenia to
negotiate using starship-based mass effect engines can instead
be traversed instantaneously via relay.  Because of their
importance in travel throughout the Milky Way, mass relays
typically form the centerpieces of sapient development all
through the galaxy. From a given relay, settlement radiates
outward via conventional FTL technology. This gives rise to star
clusters, relatively small pockets of civilization scattered
throughout the galaxy, separated by tremendou