Detecting spacecraft at distances of dozens of astronomical units presents significant challenges, particularly with the preference for laser communication over radio, which complicates third-party detection. Thermal emissions from fusion-powered spacecraft can be detectable across vast distances, but the effectiveness of tracking these emissions diminishes as distance increases. A proposed solution involves using a system similar to aviation's Traffic Collision Avoidance System (TCAS), where spacecraft periodically broadcast their position and velocity. However, the discussion highlights that while technical details can enrich worldbuilding, they should not overshadow the story's narrative, as readers typically focus on character-driven plots. Ultimately, balancing technical accuracy with engaging storytelling is crucial for effective science fiction writing.