Gravitational forces dominate the physics of the universe at large scales and EM forces have negligible effect on the course of planets and stars.

How is this possible considering EM forces are 10^36 times stronger than gravity!

It all comes down to one simple fact, EM forces are balanced with counter forces (+ vs -, N vs S) while gravity is a monopolar force. So while EM has a tendency to cancel itself out by attracting its opposite no such effect limits gravity.

My take away: nuance is everything to the big picture in any problem