Most atoms on earth came from the interstellar dust and gas from which the Sun and solar system formed however in the space science community extraterrestrial materials generally refers to objects now on earth that were solidified prior to arriving on earth in October 2011 scientists reported that one form of extraterrestrial material cosmic dust contains complex organic matter amorphous organic.

Solids with a mixed aromatic aliphatic structure that could be created naturally and rapidly by stars in February 2014 NASA announced a greatly.

Upgraded database for tracking polycyclic aromatic hydrocarbons PAHs in the universe according to scientists more than 20% of the carbon in the universe may be associated with pah –is possible starting materials for the formation of life.

PAHs seemed to have been formed shortly after the Big Bang or widespread throughout the universe and are associated with new stars in exoplanets categories to date these fall into a small number of broad categories namely meteorites too large to vaporize on atmospheric entry but small enough to leave fragments lying on the.

Ground moon rocks brought to earth by the Apollo and Luna missions unmelted micro meteorites.

Typically less than 100 micrometers in diameter collected on earth and in the Earth’s stratosphere specimens returned from space borne collection missions like NASA’s long-duration exposure facility ldef and the Stardust sample return mission a minor but notable subset of the materials that make up the foregoing collections.

Were also solidified outside of the solar system these are often referred to as interstellar materials some of which are also pre Sol.

Or ie they predate the formation of the solar system each of these types of material is treated elsewhere this entry therefore is here primarily to consider the relationship between types of extraterrestrial materials on earth.

As well as the types of extraterrestrial material we’d like to have a closer look at special characteristics oxidation state thanks to the romance between carbon and oxygen atoms which form gases when they combine the solid material in a given planetary system probably depends on whether carbon abundances.

Were greater or less than those of oxygen what is left over goes into solids.

There was more oxygen than carbon in the solar system so solid planetary surfaces as well as primitive meteorites are largely made up of oxides like silicon oxide silicates resulting.

In silicate planets if the Congress was true carbides might be the dominant form of rock resulting in carbon planet larger planetary bodies in the early solar system were hot enough to experience melting and differentiation with heavier elements like.
Nickel finding their way into the core the.

Lighter silicate rocks presumably float to the surface thus this might explain why iron on earth as surface is depleted in nickel while iron meteorites from the center of a differentiated planetoid are rich in nickel since it is not a very active rock forming.

Element most of our nickel is in the earth s core a key feature of extraterrestrial materials in comparison to naturally occurring terrestrial materials is therefore neat.


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