With advanced tech, there is no need for them to build probes. Eg. use wormholes to peek in to any location in the universe, or some other teleportation system.

With advanced tech, there is no need for them to build probes. Eg. use wormholes to peek in to any location in the universe, or some other teleportation system. Probably that's why you can't see them. Source: Sci-fi films.