This hands-on activity explores spacecraft radion communication concepts, including the speed of light and the time delay for signals sent to and from spacecraft. Through this activity, students will be able to calculate the amount of time it takes for a radio signal to travel to a spacecraft using the speed of light; demonstrate the delay in radio communication signals to and from a spacecraft; devise unique solutions to the radio-signal delay problem; and compare their velocity to that of the spacecraft and the speed of light.
http://pluto.jhuapl.edu/common/content/pdfs/NewHorizonsEarthCalling.pdf
