[American_Centurion]

Here is a list of stars within 50 light years of us.

I don't expect that during the millions of years there has been life on earth, especially considering that during at least half of that time the "bio-disc" would have only expanded to reach the 26 nearest stars that we would have passed near enough within the period of life to "infect 10,000 million" systems.

[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?

[steve-b]

Stars are not fixed in space.

[Junior]

Those are only the "visible" stars within 50 light years. Gliese lists something like 700 total stars within that sphere.