>if d is big enough, then by the time the probes have traveled 10% of
>the way, the remaining 90% will have grown larger than the original
>100%, due to the expansion of space inbetween. So if that expansion
>rate settles down to a constant, then there must be a sphere centered
>around Earth such that nothing that is outside of that sphere can
>*ever* affect Earth, even if it travels with the speed of light.
I believe you have just reinvented the canonical explanation for Olbers'
Paradox.
Damien Broderrick