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No, the sun is not Earth's satellite. The sun is a star at the center of our solar system, around which Earth and other planets orbit. Earth's natural satellite is the moon.
The main purpose of the Earth station antenna is that it receives and RF signal, which it turns into an electromagnetic wave and sends to a satellite. It then transfers the energy from the satellite to different signals and sends it to receiving equipment.
The moon is called a satellite because it is a natural object that orbits around a larger celestial body, in this case, Earth. Satellites are commonly defined as objects that orbit around a planet or a star.
The main use of a body section of a rocket is most likely to store fuel. As you can see in rocket launches it detaches after the boosters are used up and only the main capsule remains. This is seen in starlit launches where the main satellite detaches and the body falls back to earth along with the detached boosters.
The nearest star that fits the description of being a G2V class yellow dwarf and a main sequence star like our Sun is Alpha Centauri A. It is part of a triple star system located about 4.37 light-years away from Earth, making it the closest star system to our solar system.