Astronomers have achieved a major breakthrough by precisely dating a brown dwarf—a faint object that exists between planets and stars. Instead of measuring the object directly, scientists used stellar seismology to analyze subtle vibrations in its host star, revealing a system age of 2.3 billion years.

This transforms a once-mysterious object into a benchmark for testing how substellar bodies cool and evolve over time. With a reliable timestamp, researchers can now refine models that were previously based on uncertain estimates.

The discovery marks a shift in astronomy—from observation to high-precision measurement—where time itself becomes a tool for decoding the evolution of the universe.

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