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Un astéroïde est un petit corps du Système solaire composé de roche, de métaux et de glace, de forme irrégulière et dont les dimensions varient de quelques dizaines de mètres à plusieurs centaines de kilomètres1. Quand ces petits corps entrent dans l'atmosphère terrestre et qu'ils réussissent à en toucher la surface, ils deviennent des météorites.

Le premier fut découvert en 1801, on en dénombre actuellement plus de 580 000. Une grande partie