Added default value to radius, to match exploration panel
Added default value to radius, to match exploration panel

EDDiscovery/EDDiscovery,klightspeed/EDDiscovery,EDDiscovery/EDDiscovery,klightspeed/EDDiscovery,andreaspada/EDDiscovery,EDDiscovery/EDDiscovery,klightspeed/EDDiscovery,andreaspada/EDDiscovery