A binary file containing over 50,000 event timestamps. The logs describe a continuous handshake between a server identified as GRAVITY-NODE-24 and a client endpoint labeled CL1NT . What is strange is the latency: the packet round-trip times (RTTs) approach 2.5 seconds, suggesting the client is either on a severely degraded network or is located at an extreme distance—potentially lunar orbit or beyond.

But as she turned away, her console flickered. A single line of data scrolled past, too fast for anyone but a physicist to catch.

The problem was Earth’s core. Not the molten iron part—that was fine. The problem was the gravity well . For four billion years, it had hummed a single, steady note. Then, eighteen months ago, the note began to waver. Satellites wobbled. Tides pulled a little left, then a little right. In a lab in Switzerland, a kilogram mass weighed 1.0002 kilograms, then 0.9998, then back again.