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Ancient Crashes Blasted Precious Metals Into Earth, Moon and Mars

Artist's conception of the massive collision between Earth and a Mars-size object that likely created the moon about 4.5 billion years ago. (Image credit: AOES Medialab, ESA)

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Mike Wall
SPACE.COM SENIOR SPACE WRITER — Michael has been writing for Space.com since 2010. His book about the search for alien life, "Out There," was published on Nov. 13, 2018. Before becoming a science writer, Michael worked as a herpetologist and wildlife biologist. He has a Ph.D. in evolutionary biology from the University of Sydney, Australia, a bachelor's degree from the University of Arizona, and a graduate certificate in science writing from the University of California, Santa Cruz. To find out what his latest project is, you can follow Michael on Twitter.