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Also I was surprised to learn that the mass of the Moon is only 1% of Earth mass. I knew surface gravity is one sixth so I guess I sort of assumed that mass wou

• DuncanCoffee 25d ago
  It's because you have the radius on the denominator (I think) def calc_gravity(mass_1: float, mass_2: float, radius: float) -> float: G = 6.67408e-11 return G * mass_1 * mass_2 / radius**2 earth_mass = 5.972e24 earth_radius = 6.371e6 earth_g = calc_gravity(1.0, earth_mass, earth_radius) print(f"earth: {earth_g:.2f} m/s^2") moon_mass = 7.34767309e22 moon_radius = 1737.4e3 moon_g = calc_gravity(1.0, moon_mass, moon_radius) print(f"moon: {moon_g:.2f} m/s^2") print(f"earth/moon proportion: {(earth_g / moon_g):.2f}") prints earth: 9.82 m/s^2 moon: 1.62 m/s^2 earth/moon proportion: 6.04