A starship which has selected the Sensor Sweep mission will scan nearby planets for traces of other players. There is a chance that any planet within 200 Light-Years will return a report giving ownership details and the approximate level of industry present on its surface.
The chance of this industry being detected is increased if the target has more than 15 Factories or 20 Mineral Mines. However, every Defense Post reduces the chances of that planet being detected by just under 7%. A planet with 15 or more Defense Posts can not be detected by this mission unless the starship is in orbit around it.
In addition, in a game where the optional wormhole feature is enabled, this mission scans for nearby wormholes.
See also: Out of Fuel.