Meteorites such as this one likely acted as messengers early in Earth's history, delivering the building blocks of life, the researchers said.January 16, 2018
Elements on Earth, including liquid water, can change the chemical makeup of a meteorite before it's even collected. "This meteorite is special because it fell onto a frozen lake and was recovered quickly. It was very pristine. We could see the minerals weren't much altered and later found that it contained a rich inventory of extraterrestrial organic compounds," Heck said."These kinds of organic compounds were likely delivered to the early Earth by meteorites and might have contributed to the ingredients of life.
Scientists believe the Hamburg meteorite was ejected from its parent asteroid about 12 million years ago, traveling through space until it landed on Earth. An analysis of the meteorite revealed that the rock had been exposed to cosmic rays while zipping through space for 12 million years. Typically, carbonaceous chondrites are a thousand times richer in organics than H4 chondrites, Heck said. Near-Earth asteroid Bennu, which was recently sampled by NASA's OSIRIS-REx mission, is rich in carbon.
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