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Relics of an ancient planet might be hiding under our feet, according to new research. Some scientists believe that a “protoplanet” named Theia collided with Earth some 4.5 billion years ago.
The Theia-impact scenario described above; The lunar rock samples retrieved by Apollo astronauts were found to be very similar in composition to Earth's crust, and so were likely removed from Earth in some violent event. [14] [18] [19] It is possible that the large low-shear-velocity provinces detected deep in Earth's mantle may be fragments of ...
Artist's depiction of a collision between two planetary bodies. Such an impact between Earth and a Mars-sized object likely formed the Moon.. The giant-impact hypothesis, sometimes called the Theia Impact, is an astrogeology hypothesis for the formation of the Moon first proposed in 1946 by Canadian geologist Reginald Daly.
Theia, an ancient planet, collided with Earth to form the moon, scientists believe. A new study suggests Theia could have also formed mysterious blobs called large low-velocity provinces, or LLVPs.
A protoplanet is a large planetary embryo that originated within a protoplanetary disk and has undergone internal melting to produce a differentiated interior. Protoplanets are thought to form out of kilometer-sized planetesimals that gravitationally perturb each other's orbits and collide, gradually coalescing into the dominant planets .
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The title is misleading as it assumes the existence of Theia as a planet whereas it is a hypothesis. Even if it existed, it would not have been classified as a planet as it had not cleared its path. It would most have been a protoplanet or a dwarf planet, and not a planet.--EvenGreenerFish 02:44, 2 September 2015 (UTC)
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