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Japan scientists to study source of high heat on asteroid

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TOKYO – Japanese space experts said Thursday they will examine soil samples brought back from a distant asteroid in an attempt to find the source of heat that altered the celestial body, in their search for clues to the origin of the solar system and life on Earth.

Scientists at the Japan Aerospace Exploration Agency said they have made a preliminary examination of 5.4 grams (0.19 ounce) of soil, far more than the minimum 0.1 gram sample they had hoped for, which the Hayabusa2 spacecraft brought back in December from the asteroid Ryugu, more than 300 million kilometers (190 million miles) from Earth.

About 3 grams (0.1 ounce) of the black granules are from Ryugu's surface and were gathered when Hayabusa2 touched down on the asteroid in

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