Your friend goes on to say that light is produced by the connection between electricity and magnetism. Is your friend correct?

Explanation:

Yes, he/she is right to say that light is produced by the connection between electricity and magnetism and that connection is the oscillations of the electric and magnetic fields. Light is an electromagnetic wave which is composed of discrete energy packets known as photons. It is produced by the oscillations of electric field and magnetic field. If we go into the depth of it, Electrons are actually the particles which are responsible for light. Movement of electrons in the orbits, cause the radiation or light. When electrons move from lower to higher orbits they absorb enrgy and when they fall back from higher to lower orbits they radiate energy (light).

the closer the planet is to the sun, the larger the gravity