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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 .
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]
In the alternate timeline of the 2009 film, the planet Vulcan is destroyed in 2258 by the Romulan known as Nero, who had time-traveled from the future. Using his space mining vessel, Narada, Nero created a singularity in Vulcan's planetary core as part of his quest to avenge the destruction of Romulus that Spock failed to save. The resulting ...
Earth cutaway from core to exosphere. Partially to scale. Travelling to the Earth's center is a popular theme in science fiction. Some subterranean fiction involves traveling to the Earth's center and finding either a hollow Earth or Earth's molten core. Planetary scientist David J. Stevenson suggested sending a probe to the core as a thought ...
The rain-out model is a model of planetary science that describes the first stage of planetary differentiation and core formation. According to this model, a planetary body is assumed to be composed primarily of silicate minerals and NiFe (i.e. a mixture of nickel and iron). If temperatures within this body reach about 1500 K, the minerals and ...
Re-narrated Horizon episode, first aired in the UK in 1972. [4]We give you a behind-the-scenes look at the making of a nature film. Oxford Scientific Films Unit shows how it tackles such problems as filming a wood wasp laying its eggs inside trees, the hatching of a chick and the courtship rituals of the stickleback.
Full volcanic planet, magma ocean in surface. Magma oceans are vast fields of surface magma that exist during periods of a planet's or some natural satellite's accretion when the celestial body is completely or partly molten. [1] In the early Solar System, magma oceans were formed by the melting of planetesimals and planetary impacts. [1]
The planetary landscape now consists of one ocean approximately 10 miles deep in the north, another vast ocean in the south, and a vast girdle of land - a new supercontinent exposed by the water in the equator receding towards the poles - that spans the equator in its entirety. The equatorial supercontinent is surrounded by scattered giant ...