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アタカマ砂漠の謎のガラスの破片に宇宙由来の成分を検出。1万2000年前に隕石の大爆発で作られた可能性

   


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アタカマ砂漠で巨大隕石が爆発

 チリのアタカマ砂漠に謎のガラスの破片が散らばっているのが科学者の目に留まったのは10年前のこと。ケイ酸と金属酸化物で構成される塩を主体とした「ケイ酸塩ガラス」が、75キロメートルに渡り広大な回廊のように並んでいたのだ。

 そして今回、このガラスの破片を分析したところ、その成分の一部は宇宙をただよう彗星のものと一致した。

 今から1万2000年ほど前、アタカマ砂漠上空で、凄まじい隕石の爆発が起き、その熱で砂地が溶けガラスが形成されたのだという。


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