The fastest speed at which we might communicate with another technological civilization among the stars (according to our present understanding of science) is
A) the speed of sound (the natural speed for messages)
B) the speed of light
C) the speed of the Voyager spacecraft (which is typical of our space probes)
D) instantly (as fast as we want) -- if we only knew where they were located
E) the orbital speed of the Earth

Question

Quizplus · Accepted Answer

The fastest speed at which we can communicate with other civilizations is the speed of light, which is the universal speed limit. Any signals or messages we send out into space travel at this speed, and so would take thousands, if not millions, of years to reach any potentially inhabited planets.

The Fastest Speed at Which We Might Communicate with Another