Asteroid stone Dark Terror Earthlings?

Meteors that appear in the sky Chelyabinsk, Ural, Russia, last February [photo illustration] (equipmentworld.com)

Still remember the huge fireball that crashed in the Ural Mountains, Russia, on 15 February? Occurrences meteor known as 'Meteor Chelyabinsk' suddenly, not detected, so the anticipation minimal effort. 

Why? 


The earliest known meteor that crashed in Russia was formed from rock material that is difficult to see or "dark asteroids," reported the Telegraph, October 10, 2013. 

Rocks dark asteroids are thought to form after suffering the effects of the collision with another asteroid in the past. As a result, all parts of the minerals, metals, and silicate melts so asteroid turned into a black color.

Dr. Thomas Kohout from the University of Helsinki, Finland, along with Dr. Mary Gritsevich of the Finnish Geodetic Institute and the Russian Academy of Science, found fragments of a meteor that hit Russia chondrites are made ​​of non-metallic rock that formed from melting in the host rock. 

"Two-thirds of it contains chondrite meteor gray, while the rest is black chondrite. That means that black parts are residual shunt of the early history of the formation of the asteroid," said Kohout. 

Furthermore, he said the meteor Chelyabinsk is a fragment of an asteroid-asteroid that collided early in the solar system formed 4.6 billion years ago and have not changed to this day its dark color. 

"The color of a dark meteor that is the cause why it is not detected by any space agency, so we were very surprised when the celestial body was burning in the atmosphere and glide to Earth," he said. 

Kohout with other researchers hope to better study the meteors come from asteroids dark, so that its presence can be detected and tracked in the future. 

Stone meteoroids that hit Chelyabinsk, Ural Mountains region, Russia. (Telegraph) 

1,425 asteroids 

Currently, the Program of NASA's Near Earth Object tracked 10,303 asteroids and 1,425 of them are classified as potentially hazardous asteroids to Earth. 

"Most asteroids tracked using radar that rely on light. However, very difficult to detect dark asteroids while in low-light environments," said Kohout. 

Kohout and Gritsevich has presented his findings at the American Astronomical Society's Division for Planetary Sciences, in Denver, Colorado, USA. The findings could help to trace the dark asteroids that are dangerous to the Earth. 

"People in Russia are lucky, Chelyabinsk meteor coming from mostly dark asteroid had burned up in Earth's atmosphere. However, there are still many dark asteroids that lurk in the Solar System and at times can fall to Earth," Kohout lid.