What is the Limitation of Interstellar Communication for Humans?

[Orion1]

HD 10180 star system

HD 10180 is a solar-type star that scientists believe has at least five planets, and possibly as many as seven. It is 127 light-years away, in the southern constellation of Hydrus. The mass and metallicity of HD 10180 are 6% and 20% greater than the values of the Sun.

The system contains five Neptune-sized planets (with minimum masses from 12 to 25 times Earth's; spurious detection probabilities ≪ 0.1%) at orbital radii of 0.06, 0.13, 0.27, 0.49 and 1.42 AU. In addition, there is a possible Earth-sized planet located at 0.02 AU (minimum mass 1.4 times Earth's; spurious detection probability 1.4%), and a possible Saturn-sized planet at 3.4 AU (minimum mass 65 times Earth's; spurious detection probability 0.6%). This represents the largest number of planets detected in an extrasolar planetary system (the previous record holder, the 55 Cancri system, has five).

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Reference:
http://en.wikipedia.org/wiki/HD_10180"
http://en.wikipedia.org/wiki/55_Cancri"
http://www.youtube.com/watch?v=r96nO0qoLUU&feature=player_embedded"

 

[Radrook]

127 light years away! That's approx thirty-one times farther than our nearest star.
Two-way communication would take more than two-hundred fifty years. Anyone sending a message would be dead by the time a reply arrived.

 

[Orion1]

Active two-way personal human to human (or alien) communication between any two different star systems would be limited to about 40 light years radius and only one message per human lifetime.
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