Although the mercury content of iron in its much smaller than the Moon, but it is darker than the Moon, astronomers have been puzzled. But recently, scientists have finally solved the mystery. The latest study found that mercury has a large number of graphite, and it may be formed in ancient magma oceans of exposed remnants of massive carbon shell.
A year ago, scientists first identified, the surface of mercury is so dark, because dark matter caused by carbon, rather than the more typical (such as iron or titanium). Astronomers model simulation shows that mercury may have in the solar system are graphite-rich Comet impacts at an early stage. However, NASA's "Messenger" task to collect the evidence of graphite, the researchers used "the courier" neutron spectrometer, spatial analysis of distribution of carbon, and found it most dark matter and mercury-related, and this substance is most likely derived from the Earth's crust deep.
"The Messenger" task the final phase of flying at low altitude of graphite collected data indicate that Mercury's surface may be constituted by a few percent carbon, much more than other rocky planets in the solar system, they are likely to come from deep in the planet, and not from the comet.
Researchers said the graphite might formed by the crystallization of magma Ocean, formed a raw crust. Now, this layer of the Earth's crust hidden below the surface of mercury, and extraterrestrial impact exposed part.
Through this research, scientists believe that Mercury's surface precisely because of the darkness and has a large number of graphite-related.
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