'International beam team' solves Martian meteorite-age puzzle

By directing energy beams at tiny crystals found in a Martian meteorite, geologists have proven that the most common group of meteorites from Mars is almost four billion years younger than many scientists had believed -- resolving a long-standing puzzle in Martian science and painting a much clearer picture of the Red Planet's evolution that can now be compared to that of habitable Earth.

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