class SpaceAge {
  final Map<String, num> planets = {
    'Mercury': 0.2408467,
    'Venus': 0.61519726,
    'Mars': 1.8808158,
    'Jupiter': 11.862615,
    'Saturn': 29.447498,
    'Uranus': 84.016846,
    'Neptune': 164.79132,
    'Earth': 1,
  };

  double age({required final String planet, required final int seconds}) {
    return double.parse(
        (seconds / (31557600 * planets[planet]!)).toStringAsFixed(2));
  }
}