[American_Centurion]

I would like to correct something from my previous.

The article estimated the "bio-disc" to be maybe 30 LY accross so that would mean that only stars within 25 LY of us now would be able to contact it, which would mean half-way back though the period of life the bio-disc would be less than 7.5 LY accross or less, making half of the 26 nearest stars unreachable for half the period of life meaning my math was off by several orders of magnitude. But you get the picture right?

[American_Centurion]

Need proof reading leassons.

25LY should be 15LY.

[Junior]

During the past 4.6 billion years, the local neighborhood has changed considerably. Some of the stars nearby were much further away and those further away were once much closer. One must also take into account the "wake" of debris our Solar System has smeared along its orbit around the center of the galaxy during its several rotations in that time. Other stars are passing through that wake all the time, some of them are hundreds, if not thousands of light years away.