During the formation of the solar system, not all of the materials in the vast could of dust and gas were used. What happened to the remaining ice, metal, and rock? It formed what became known as asteroids, comets, and meteors. Take a look at the significance of these objects and the possible impact they have on humankind.
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语言 英语 ● 格式 PDF ● ISBN 9780822563631 ● 出版者 Lerner Publishing Group ● 发布时间 2000 ● 下载 3 时 ● 货币 EUR ● ID 5845994 ● 复制保护 Adobe DRM
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