I am working on some changes to how exploration will work, both in discovering systems and actually exploring them.  I'm still working on numbers, but discovering will require a new currency (Fuel) and you will be able to use more Fuel to specify a classification of planet to find.  Also, planets with hazards will require life support to explore.  I am still working on how exactly users will get these resources/items, so until I do these changes will not take effect.