What does cold mean yo scientists

Convection occurs when thermal energy is transferred by the movement of

1which body contains the majority of the mass in the solar system earth jupiter the moon the sun 2 what keeps the objects in the solar system such as planets orbiting around the sun the force of gravity the galaxy exerts on all objects within it including the solar system the great distance between the sun and the planets the sun's nuclear fusion which acts on each object the gravitational force between the sun and each object in the solar system

Based on the diagram of the electric field lines around the two spherical charges, what are the signs of the left and right charge respectively?