munroburton wrote:They could skip the red dwarves and concentrate on the F/G/K type stars. Those make up about a fifth of all stars, so three and a half million stars. If we ignore mismatched binaries for this exercise, that could be as few as two million locations to check.
10,000 ships taking one week to check each location could complete a grand survey of this lower bound in just four to five years. Including all red dwarves extends this to about twenty to twenty-five years.
I've suggested it before, the SLN could probably accomplish this sort of hunt on a timescale short enough to disrupt the Alignment's plans. Nobody else has the sheer quantity to do it.
It occurs to me--we are looking for a system that has been colonized for a long time. There's another way to find it that doesn't require checking every star and risking one's hyper footprint being seen. (After Galton I'm sure the sensors at Darius have been way upgraded.)
Send out a fleet. They aren't going to stars at all, they're going to points on a grid that is say 30ly apart. Upon arrival they point a radiotelescope at every star within say 20ly. They are simply looking for stars that are unduly noisy in the radio band. No signals will be picked up at that range, but the star should still be radio-noisy. Especially of interest are frequencies commonly used by navigation radars.
This will result in some false positives that have to be probed very carefully, but it greatly cuts down on the number of spots that must be visited.
(And my 30ly is being conservative--against our tech Earth would be spotted at a considerably greater range.)