public class SystemData
{
    public Vector Position = new Vector();
    public int Coordinate = 0;
    public long SystemId = 0;
    public string NaughtyString = "";
    public List<SystemDistance> sysDistances = new List<SystemDistance>();
}
public class SystemDistance
{
    public double Distance = 0;
    public int Coordinate = 0;
    public long SystemId = 0;
}

    SystemData[] nSys = new SystemData[Gal.Systems.Count()];
        for (int s = 0; s <= nSys.Count(); s++)
        {
            for (int t = 5000; t >= s; t--)
            {
                SystemDistance nD = new SystemDistance();
                nD.Distance = new Vector(nSys[t].Position - nSys[s].Position).GetLength();

                nD.Coordinate = nSys[t].Coordinate;
                nD.SystemId = nSys[t].SystemId;
                nSys[s].sysDistances.Add(nD);

                nD.Coordinate = nSys[s].Coordinate;
                nD.SystemId = nSys[s].SystemId;
                nSys[t].sysDistances.Add(nD);
            }
        }