They never established exactly how far ahead the seed ships were, but I always assumed it was a substantial distance. They did once joke about it when they found the artificial star system.
"This isn't on our charts from the seeder ships, but a system like this has to be at least several million years old."
"Exactly how far ahead of us are the seed ships?"
"This isn't on our charts from the seeder ships, but a system like this has to be at least several million years old."
"Exactly how far ahead of us are the seed ships?"