Salty 'peanut' asteroid may reveal where Earth got its water

Tiny salt grains discovered in samples returned by the Hayabusa mission could indicate that the largest population of space rocks in the solar system is more watery than previously thought.

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Japan , Tom Zega , Shaofan Che , University Of Arizona Lunar , Planetary Laboratory , Salt Crystals , Itokawa , Asteroid Impacts , Solar System , Sodium Chloride , Steroid Bombardment , Water , Earth ,