Just a little semi-cheaty thingy I use and can't remember reading it anywhere. I discovered this not long after I started playing.
When exploring you see the borders of terra incognita and if you go to the economy screen you can see if these undiscovered areas belong to any one or not. The colour of the COT will show up on colonized places while uncolonized will remain white meaning you can concentrate on exploring the new places/making contact whatever you want.
When exploring you see the borders of terra incognita and if you go to the economy screen you can see if these undiscovered areas belong to any one or not. The colour of the COT will show up on colonized places while uncolonized will remain white meaning you can concentrate on exploring the new places/making contact whatever you want.