Scientists Report One of the Oldest Mars Meteorites
Scientists say they have found one of the oldest known meteorites from Mars, a rock found in the Sahara Desert. Reports put its age at about 4.1 billion years. Studies of such rocks can shed light on Mars' early history.
Context
A meteorite is a rock from space that lands on Earth, and scientists study them to learn about other planets without a spacecraft. Mars rocks reach Earth after being knocked off the planet by an impact, so they are rare finds.
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