[meteorite-list] NASA finds surprising features in Chelyabinsk meteor debris

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NASA finds surprising features in Chelyabinsk meteor debris

"Researchers at NASA have reported new data revealing some of the
mysterious history of the Chelyabinsk meteor. The 20-meter object burst
into fragments over the city of Chelyabinsk in Russia over two years
ago, but this new data analysis sheds new light on the nature of the
meteor.

According to a report by Forbes, NASA has revealed that “the
meteor’s orbital parent body itself had likely been
geologically-impacted as many as a dozen times.”

While the impact of the meteor over Earth caused widespread destruction
in the area of Chelyabinsk, it only reached the ground in small
fragments.

Scientists studied two samples of the meteorite, weighing 15 and 20
grams respectively, to garner information about the meteor’s mineral
composition and age. These pieces are thought to have come from the
outer part of the meteor as it fragmented in Earth’s atmosphere. Based
on its composition, the Chelyabinsk object appears to be a chondrite –
a stony meteorite that resembles its parent body in composition."


The results of NASA’s analysis suggest that the parent body asteroid
may have formed about 4.5 billion years ago. However, Kevin Righter of
NASA explained that this age estimate was only one of several gauged
from different techniques used to calculate age.

Source:
http://thespacereporter.com/2015/03/nasa-finds-surprising-features-in-chelyabinsk-meteor-debris/