In talk.origins Charlie Siegrist <none.active@this.time.check.back.later> wrote:

On Sat, 16 Aug 2008 19:31:07 +0000, Paul J Gans wrote:

Because the radio age *here* will last only about 200 years, if that.

I don't see why.  As fiber-optic communication spreads, microwave point-
to-point is tending to decrease, but cell phone and other personal radio 
communication devices are proliferating at a strong rate.  What will take 
the place of that, along with: shipboard radar and radio?  Personal and 
professional GPS equipment?  Aircraft communication and landing systems?  
Rush Limbaugh and Howard Stern?

Cell phone and similar devices are very low power and not at all
apt to be picked up very far away.

Shipboard radar and the like are aimed and not much is broadcast
widely at all.

For comparison check the power used to reach the landers on Mars,
and that's aimed stuff, not spread over a wide area.  And that gets
you to Mars.


-- 
   --- Paul J. Gans