The specks are tiny. No, really tiny. Smaller than the diameter of a hair. But they hold billions of years of history that reveal some of the secrets of asteroids.
TOKYO, Japan –
The three samples were collected in 2005 from the peanut-shaped Itokawa, some 300 million kilometres from Earth. But rubble-pile asteroids have a very different structure, composed of rocks, dust, pebbles and a void, and held together by the gravitational pull of their various components.To find out just how good, the team analysed crystal structures in the samples, looking for deformations caused by the impact that created Itokawa.The methods suggest Itokawa was formed by an asteroid collision at least 4.2 billion years ago, ten times older than solid asteroids of similar size are predicted to be.
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