Exploration is not really a specific job people can identify with anymore. It has to resonate with the general populace and with women.
In TOS and TNG, exploration was by no means limited to just new worlds and astronomical phenomena, it also included investigating anything our heroes came upon that wasn't quite right. That enabled them to also seek out and deal with threats to Earth/Federation, something amiss on a Federation member world or colony, or a Starfleet/civilian effort gone south, etc.--anything unusual that might require our heroes to take a look and see what's going on or what's wrong.
In a real sense, the various CSI and Law & Order shows are exploration shows, but they explore murders and other crimes.