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A planetary core consists of the innermost layers of a planet. [1] Cores may be entirely liquid, or a mixture of solid and liquid layers as is the case in the Earth. [2] In the Solar System, core sizes range from about 20% (the Moon) to 85% of a planet's radius .
Due to their greater distance from the Sun, the solid objects in the outer Solar System contain a higher proportion of volatiles such as water, ammonia, and methane, than planets of the inner Solar System because their lower temperatures allow these compounds to remain solid, without significant sublimation. [20]
A wealth of new information about Earth’s inner core has surfaced in recent months. Scientists now have evidence that the planet’s innermost layer is changing shape.
Earth's inner core is the innermost geologic layer of the planet Earth. It is primarily a solid ball with a radius of about 1,220 km (760 mi), which is about 20% of Earth's radius or 70% of the Moon's radius. [1] [2] There are no samples of the core accessible for direct measurement, as there are for Earth's mantle. [3]
The innermost inner core model proposes a distinct laterally homogeneous anisotropic sphere within the inner core. [1]Estimates differ on the size of the innermost core. Dziewonski and Ishii think a radius of 300 km. [1] Trampert et al. propose a different model, with a radius of 400 km
The findings open up new ways to investigate the inner core, according to lead author Thanh-Son Phạm. ANU also believes the innermost inner core hints at a major event in Earth's past that had a ...