private void ShowSelectedItemInfo(object sender, RoutedEventArgs e)
        {
            if (ListView.SelectedItem == null)
            {
                return;
            }

            SpaceObject oldObj = ListView.SelectedItem as SpaceObject;
            SpaceObject newObj = oldObj.GetCopy();

            OpenInfoWindow(newObj, delegate() {
                _universe.Remove(oldObj);
                _universe.Add(newObj);
                sky.ItemsSource = _universe;
            });
        }