astro_constants.py

G = 6.6743*10**(-11)

masses = {'Mercury': 3.285E23,
          'Venus': 4.867E24,
          'Earth': 5.972E24,
          'Mars': 6.39E23,
          'Jupiter': 1.898E27,
          'Saturn': 5.683E26,
          'Uranus': 8.681E25,
          'Neptune': 1.024E26,
          'Moon': 7.342E22,
          'Io': 8.9319E22,
          'Europa': 4.8E22,
          'Ganymede': 1.4819E23,
          'Callisto': 1.0759E23,
          'Titan': 1.3452E23,
          'Enceladus': 1.08E20,
          'Sun': 1.989E30}

distances = {'Mercury': 57909227,
             'Venus': 108209475,
             'Earth': 149598262,
             'Mars': 227943824,
             'Jupiter': 778340821,
             'Saturn': 1426666422,
             'Uranus': 2870658186,
             'Neptune': 4498396441,
             'Moon': 384400,
             'Io': 421800,
             'Europa': 671100,
             'Ganymede': 1070400,
             'Callisto': 1882700,
             'Titan': 1221870,
             'Enceladus': 238020}