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Planetary Defense: Asteroid Findings From Specks of Space Dust Could Save Earth

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Curtin University-led research into the durability and age of an ancient asteroid made of rocky rubble and dust, revealed significant findings that could contribute to potentially saving the planet if one ever hurtled toward Earth. The international team studied three tiny dust particles collecte

The study’s results showed asteroid Itokawa, which is 2 million kilometers from Earth and around the size of Sydney Harbour Bridge, was hard to destroy and resistant to collision.

“Unlike monolithic asteroids, Itokawa is not a single lump of rock, but belongs to the rubble pile family which means it’s entirely made of loose boulders and rocks, with almost half of it being empty space,” Professor Jourdan said. “The huge impact that destroyed Itokawa’s monolithic parent asteroid and formed Itokawa happened at least 4.2 billion years ago. Such an astonishingly long survival time for an asteroid the size of Itokawa is attributed to the shock-absorbent nature of rubble pile material.The Curtin-led team used two complementary techniques to analyze the three dust particles. The first one is called Electron Backscattered Diffraction and can measure if a rock has been shocked by any meteor impact.

“We set out to answer whether rubble pile asteroids are resistant to being shocked or whether they fragment at the slightest knock,” Associate Professor Timms said.

 

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