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I'm guessing they use radio waves, but radio waves travel at the speed of light, which would take some time to travel to the spacecraft (if it is far out near Saturn or Jupiter). Also, there were camera recordings of some spacecraft falling into a planet and what it saw there. How are these recordings relayed back to Earth. On a planet like Venus, wouldn't the atmosphere prevent the signals from going through?
And got the following answer:
Radiowaves are transparent to atmospheres, and there was no mothership. The time delay is well-known. The data of an image in digital format can be transmitted by radio waves "...RadarRadar (Radio Detection And Ranging) detects objects at a distance by bouncing radio waves off them. The delay caused by the echo measures the distance. The direction of the beam determines the direction of the reflection. The polarization and frequency of the return can sense the type of surface. Navigational radars scan a wide area two to four times per minute. They use very short waves that reflect from earth and stone. They are common on commercial ships and long-distance commercial aircraft. General purpose radars generally use navigational radar frequencies, but modulate and polarize the pulse so the receiver can determine the type of surface of the reflector. The best general-purpose radars distinguish the rain of heavy storms, as well as land and vehicles. Some can superimpose sonar data and map data from GPS position. Search radars scan a wide area with pulses of short radio waves. They usually scan the area two to four times a minute. Sometimes search radars use the Doppler effect to separate moving vehicles from clutter. Targeting radars use the same principle as search radar but scan a much smaller area far more often, usually several times a second or more. Weather radars resemble search radars, but use radio waves with circular polarization and a wavelength to reflect from water droplets. Some weather radar use the Doppler effect to measure wind speeds.  Data (digital radio) Most new radio systems are digital, see also: Digital TV, Satellite Radio, Digital Audio Broadcasting. The oldest form of digital broadcast was spark gap telegraphy, used by pioneers such as Marconi. By pressing the key, the operator could send messages in Morse code by energizing a rotating commutating spark gap. The rotating commutator produced a tone in the receiver, where a simple spark gap would produce a hiss, indistinguishable from static. Spark-gap transmitters are now illegal, because their transmissions span several hundred megahertz. This is very wasteful of both radio frequencies and power. The next advance was continuous wave telegraphy, or CW (Continuous Wave), in which a pure radio frequency, produced by a vacuum tube electronic oscillator was switched on and off by a key. A receiver with a local oscillator would "heterodyne" with the pure radio frequency, creating a whistle-like audio tone. CW uses less than 100 Hz of bandwidth. CW is still used, these days primarily by amateur radio operators (hams). Strictly, on-off keying of a carrier should be known as "Interrupted Continuous Wave" or ICW or on-off keying (OOK). Radioteletype equipment usually operates on short-wave (HF) and is much loved by the military because they create written information without a skilled operator. They send a bit as one of two tones using frequency-shift keying. Groups of five or seven bits become a character printed by a teleprinter. From about 1925 to 1975, radioteletype was how most commercial messages were sent to less developed ..." http://en.wikipedia.org/wiki/Radio ",,,environment. Planetary research involves many scientific disciplines and requires a variety of instruments and techniques, including astronomical studies from the Earth, planetary spacecraft flybys, orbiters, and probes, and eventually manned landings. Each of the various approaches used has a particular strength that the experimenters try to exploit. Thus far, most planetary radio astronomy has been carried out from the ground, but the techniques carry over to spacecraft as well. Planetary radio astronomy measurements provide complementary data to other observational techniques. They also provide some unique data. For example, radio measurements can be used to provide information about planetary atmospheres and planetary subsurface materials to much greater depth than other remote sensing techniques. The greater penetration is a result of neutral gases and solids being more transparent to radio waves than higher-frequency waves such as infrared or visible light. Also, the scattering from particulate materials in planetary atmospheres is generally less at radio wavelengths than at shorter wavelengths. The relative transparency of atmospheres, clouds, and surfaces to radio waves allows the planetary radio astronomer to measure thermal profiles of planetary atmospheres beneath the cloud layers in the atmosphere and to measure temperatures beneath the solid surface of the planet. Taking advantage of this property, radio astronomers were the first to measure the very high surface temperature of cloudcovered Venus. 4..." http://www.radio-astronomy.org/library/Radio%20Astronomy%20Planetary.pdf http://www.ehow.com/facts_6777455_microwave-radio-technology.html