Question

How are communication signals on the ground sent to spacecraft?

a )the signals must be sent from ground stations to orbiting satellites and then on to spacecraft.

b )the signals are sent directly to spacecraft using radio waves.

c )the signals will not reach the spacecraft directly from earth.

d )the signals must be changed to another form at ground stations to travel through space.

Answer 1

d) the signals must be changed to another form at ground stations to travel through space.

Step-by-step explanation:

Spacecraft use transmitters to communicate with people on Earth. This are sent in the form of signals.