Now Reading: Mercury is still shrinking as its massive core cools and cracks its crust
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Mercury is still shrinking as its massive core cools and cracks its crust
Mercury is still shrinking as its massive core cools and cracks its crust
Mercury is still contracting, and new images from NASA's MESSENGER mission show that its cooling metallic core, which makes up nearly 85% of the planet's radius, continues to crack its thin crust.…
The Story in Brief
Mercury is still contracting, and new images from NASA's MESSENGER mission show that its cooling metallic core, which makes up nearly 85% of the planet's radius, continues to crack its thin crust. A study in Nature Geoscience catalogued 190 young grabens, or dropped strips of ground, many around 300 million years old or younger, clustered near the Caloris basin.
The planet's core measures 2,074 km across, while the outer shell is only 400 km thick. NASA reports that earlier surveys underestimated Mercury's shrinkage by up to seven times. The European Space Agency's BepiColombo mission, set to enter orbit, should provide sharper images of these tectonic features.
The Indian Opinion
The lazy narrative here is that space news is too remote to matter. But Mercury's odd structure, a giant core under a wafer-thin crust, challenges assumptions about how rocky planets evolve. That directly informs Earth geology and exoplanet models. The real test will come when BepiColombo delivers higher-resolution images: do the young fault scarps match the cooling rate the data predicts?
Source: timesofindia.indiatimes.com
This story was synthesised by AI from the source linked above.
