WASHINGTON - In Jules Verne's classic 1864 novel Journey to the Centre of the Earth, adventurers descend through an Icelandic volcano into a vast underground world populated by prehistoric creatures as they explore our planet's interior. The actual centre of the Earth is nothing like this fanciful depiction - and in some ways is even more dramatic. Researchers on Tuesday...
A Blue Marble image of the Earth taken from the VIIRS instrument aboard NASA's most recently launched Earth-observing satellite - Suomi NPP, received by Reuters, on Jan 25, 2012.WASHINGTON - In Jules Verne's classic 1864 novel Journey to the Centre of the Earth, adventurers descend through an Icelandic volcano into a vast underground world populated by prehistoric creatures as they explore our planet's interior.
Scientists in 2002 proposed that lurking within this inner core was an innermost section separate from the rest, akin to a Russian Matryoshka nesting doll. The increasing sophistication of seismic monitoring enabled this to be confirmed. The inner core's outer shell and its newly confirmed innermost sphere both are hot enough to be molten but are a solid iron-nickel alloy because the incredible pressure at the center of the Earth renders it a solid state."I like to think about the inner core as a planet within the planet. Indeed, it is a solid ball, approximately the size of Pluto and a bit smaller than the moon," said Australian National University geophysicist and study co-author Hrvoje Tkalčić.
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