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A little bit of Mars on Earth

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12:01pm, August 3, 2004

Sending rovers on a 500-million-kilometer journey to explore the Martian landscape isn't the only way to uncover the history of the Red Planet. Chunks of rock that have been chipped from Mars by ancient impacts and then pulled to Earth by our planet's gravity provide planetary scientists with rare and inexpensive opportunities to investigate the Red Planet's past. To date, researchers have studied about 24 Martian meteorites.

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