Which of the following is NOT a primary component of a satellite?

• A. Power source
• B. Communication system
• C. Propulsion system
• D. Landing gear

Answer: (D)

Landing gear is not a primary component of a satellite because satellites are designed to operate in the vacuum of space and do not land like aircraft or spacecraft that return to Earth. Unlike airplanes or space vehicles that require landing gear for landing and takeoff, satellites are deployed into orbit and typically remain in space for their operational lifespan without needing to land.

In contrast, a power source is essential for providing energy to operate all of the satellite's systems. This could involve solar panels or batteries that supply the necessary electrical power. The communication system is vital for transmitting data to and from the satellite, enabling it to relay information back to Earth or communicate with other satellites. A propulsion system, while not always present in all satellites, is commonly utilized for maneuvering in orbit, making adjustments to orbit, or controlling orientation. Thus, the presence of these systems is crucial for the satellite's functionality in space.