I think sun because:
-Sun is the strongest force. It has the largest gravitational pull.
-the moon and Earth both depend on the Sun for different things.
-The sun is not greatly affected by the Moo or the Earth.
:)

<u>Hydroelectric power,</u> also called hydropower is the electricity produced from generators driven by turbines that convert the potential energy of falling or fast-flowing water into mechanical energy.
Answer:
it is an upside-down image but the brain realizes it and corrects it in its orientation so we see it in right direction.