The New Voyager program continues to this day. It is no longer the primary form of interstellar exploration as it was in its infancy, though they do go places where no ship can survive. The tiny probes scout safe routes through stellar clusters and nebula, or map the edges of black holes. They float on the outer edges of star systems and scan for threats coming from the outside. Or they look inward at threats coming out to them. Even the Chinese and Russians use less intelligent versions of them, lacking the cybernetic intelligences that bring Western probes to life. The tiny solar sail-powered probes have gone everywhere humanity has traveled. And beyond.