Mercury Is Shrinking Faster Than Scientists Expected, Report Says

Mercury, the smallest planet in the solar system, is contracting at a rate faster than scientists had anticipated, according to a report published Sunday by the Arabic-language newspaper al-Sharq Al-Awsat.

The outlet's headline states that the planet's shrinkage is outpacing earlier scientific projections, though the report does not specify the measurements or time frame behind that assessment.

The finding concerns Mercury's ongoing cooling and the resulting contraction of its surface, a process that has drawn attention because of the planet's position as the closest world to the Sun and the smallest of the eight planets. Al-Sharq Al-Awsat presented the faster-than-expected shrinkage as the central point of its coverage, framing it as a development that diverges from what researchers had previously forecast.

The report, dated September 13, 2026, did not include the names of the researchers involved, the methods used to measure the contraction, or the specific figures that led to the revised assessment. It also did not indicate which scientific team or institution produced the underlying work.

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Because the available material is limited to the headline and a brief summary, the precise scale of the discrepancy between observed shrinkage and earlier predictions remains unclear, as does whether the finding has been published in a peer-reviewed journal.

What to watch next: whether the researchers behind the finding release detailed measurements or a full study that clarifies how much faster Mercury is contracting and what that means for models of the planet's interior.