A handout photo. The largest Aletai meteorite weighs 28 tonnes and was found by a farmer in 1898. More have been found in the area in recent years.When an asteroid entered the Earth's atmosphere — probably long ago — above what is today's Altay area of Xinjiang, in the far west of China, the thermal shock ripped it apart and created one of the world's biggest iron meteor showers.
"The trajectory explained why asteroid Aletai has the longest known 'strewn field', which is an ellipse-shaped area where meteorites from a single fall are found." Researchers from mainland China, Macau, the United States and Europe used different combinations of initial mass, speed and entry angle to simulate the asteroid's trajectory.
"Had it been steeper or flatter, the asteroid would have either smashed from above to form a much shorter strewn field, or bounced back to outer space." More iron meteorites have been found in the area in recent years since 2004, but scientists initially did not realise they belonged to the same asteroid.
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