c# – Objects not saving their own information

public class Planet
{
    private string PlanetName;
    private double PlanetMass;
    private double PlanetDistance;

    public Planet(string name)
    {
        PlanetName = name;
    }

    public void SetPlanetName(string name)
    {
        PlanetName = name;
    }

    public string GetPlanetName()
    {
        return PlanetName;
    }

    public void SetPlanetMass(double mass)
    {
        PlanetMass = mass;
    }

    public double GetPlanetMass()
    {
        return PlanetMass;
    }

    public void SetPlanetDistance(double distance)
    {
        PlanetDistance = distance;
    }

    public double GetPlanetDistance()
    {
        return PlanetDistance;
    }
}

PlanetName, PlanetMass and PlanetDistance shouldn’t have been static.