Japan's Hayabusa spacecraft that landed twice on the asteroid Itokawa found it to be a "rubble pile" of 4.5-billon-year-old planetary debris that loosely coalesced only about 10 million years ago, rather than a much older intact body like previous asteroids visited. This means researchers discovered--180 million mi. from Earth--a new baby of the solar system. It's just one of many findings from the $100-million mission that will affect theories on the formation of planets and small ...

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