The correct answer is option 4: The satellite does not require any energy for orbiting.

Option 1 is incorrect because satellites are not kept in orbit through remote control from a ground station. Once a satellite is launched into orbit, it follows a predetermined path without constant adjustments from the ground.

Option 2 is incorrect because although retro-rockets may be used to initiate or adjust a satellite`s orbit, they are not the primary mechanism that keeps the satellite in orbit. Solar energy also does not directly keep the satellite moving around the Earth.

Option 3 is incorrect because while satellites do rely on energy from solar panels to power their systems, they do not require solid fuels for orbiting. The propulsion systems of satellites are typically used for maneuvering and adjusting their orbits, not for continuous propulsion during their orbit.

Overall, option 4 is the correct statement because once a satellite is in orbit, it continues to move in that orbit without requiring any additional energy or propulsion. This is due to the balance between the satellite`s speed and the gravitational pull of the Earth.