TraCSS issued roughly 45 times as many conjunction events as EU SST because of differing data sources and thresholds, showing that compatible formats do not ensure shared operational meaning for autonomous spacecraft.

Existing standards provide machine-readable warnings but lack an interoperable account of commitment and fallback; the article proposes messages carrying four states—observation, intent, commitment and fallback.

As lunar navigation services expand, the same gap requires open, machine-executable yield protocols that respect temporary coordination without creating exclusive ownership before traffic patterns harden.

An October comparison exposed a gulf between orbital warning systems. As lunar navigation expands, autonomous spacecraft and rovers need a common way to communicate intent, yield, and act when coordination fails.

Two systems can watch the same sky and tell operators different stories about danger. On October 7, the U.S. Office of Space Commerce published a joint comparison between its Traffic Coordination System for Space, or TraCSS, and the European Union Space Surveillance and Tracking service. Over the period examined, TraCSS published roughly 45 times as many conjunction events as EU SST. That did not mean one system was 45 times better, or that the other was missing 45 times as much danger. Data sources and publication thresholds differed.

The study is important precisely because neither side needed to be incompetent for the outputs to diverge. The systems exchanged information in compatible forms, but did not necessarily assign the same operational meaning to it. That is manageable when human specialists have time to compare assumptions. It becomes a more consequential problem when autonomous spacecraft receive those messages and begin planning maneuvers.

Now extend that problem to the Moon. On October 12, the European Space Agency introduced NovaMoon as another step toward lunar positioning and navigation services. One week later, Uzbekistan became the 77th signatory of the Artemis Accords, which emphasize transparency and coordination during increasingly diverse lunar activities. Together, these developments point toward a new requirement: machines need to know not just where another machine is, but what each is committed and permitted to do when their operations conflict.

The warning exists. The obligation is less clear.

Space is not beginning from a blank technical page. The international Conjunction Data Message standard already gives operators machine-readable information about close........

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