How long does it take for transmissions from Cassini to reach Earth?
Traveling at the speed of light, radio signals from Cassini will take one hour and 24 minutes to reach Earth when Cassini arrives at Saturn. As Saturn and Earth move in their orbits around the Sun during the course of Cassini’s four-year tour, the distance between the two planets will vary and the “one way light time” will change accordingly. To read more about time’s impact on communications between Cassini and Earth, visit http://saturn.jpl.nasa.gov/mission/saturntourdates/saturntime/.
