At the start of your turn you can launch a probe to scan a single square of the map and you’ll be provided with a basic scan survey of that area. Only you will be given that information, so do with it what you will.
The probes can pick any SINGLE square other than the suns (because they will be obliterated obviously).
These are special probes given by the Arkships and any probes you create afterwards will have substantially more limited range, so choose your targets wisely.
You can launch three probes at the start of the game.