How long will it take a message to travel from Pluto or the outer planets to Earth?

1 Answer

The radio waves travel in vacuum 300,000 kilometers/second.


Approximate time for planets.
Pluto 5.5 hours
Neptune 4.1 hours
Uranus 159 minutes
Saturn 79 minutes
Jupiter 43.2minutes
Mars 12.6 minutes.
As the elliptical ,orbit changes distance to some extend..The given are only averages.