Did you know this was possible?

[DavidG]

That you can have a ship fly through a system and yet it is still unexplored?

Using the trick I saw in another thread wereby if you enter an unexplored system you can click a random sector and then you can continue to move into the system instead of stopping at the warp.
Well if that sector you pick happens to be a another warp point you fly through the sector into the next without seeing it.