g on the Moon, Mars and Jupiter

Each body in the list has a mass and a radius. You will make the program find $g$ on each one with $g = \dfrac{GM}{R^2}$, pick out the body with the strongest gravity, and compare the Earth with the Moon. Then it draws $g$ as bars.

The idea. A bigger mass gives a bigger $g$; a bigger radius gives a smaller one, because the surface is further from the centre.

Your tasks.

1. Inside the loop, work out g for each body, in $\text{m/s}^2$.
2. Set strongest to the name of the body with the biggest $g$.
3. Find times, how many times $g$ on the Earth is $g$ on the Moon.