Asteroid Itokawa samples were collected by the Japanese Hayabusa mission in 2005 and delivered to Earth in 2010.
Asteroid Itokawa samples were collected by Japan's Hayabusa mission in 2005 and delivered to Earth in 2010.The existence of tiny salt crystals of sodium chloride was discovered in the samples of this peanut-shaped S-type asteroid. When the sample was examined under a microscope, the small particles were noted to be about 150 micrometers in diameter — roughly twice the diameter of a human hair.
Another noteworthy element of this research is that S-type asteroids are often devoid of water-bearing materials. However, these types of near-Earth asteroids are common in space. It has been widely assumed that organic-rich C-type asteroids were one of the primary sources of water on Earth.
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