SPS/Pulsars

RBW said:

Who is going to put in beacons that will only be good
after the signal gets across some large number of
(light) years?

Tomb:

Good point! So presumably for us to erect a meaningful beacon, we'll
need
some FTL system (maybe something that works on that mated pair of
subatomic
particles where a change in one is a change in another no matter how far
away,
or something hyperspacial). 

Hadn't thought about the time lag. Makes building a galactic beacon a
real long