Over the past 200 years, the distance we've been able to send signals has expanded a million times.
The furthest we used to be able to send a signal was as far as the eye could see, or the ear could hear. So the 'maximum transmission distance' was a few miles.
Now we can send signals to the far reaches of the solar system - many millions of miles. The trouble is that it takes many days or even years to get there...
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