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Mercury has a surface unlike any other planet's in the solar system, instead resembling a rare type of meteorite, researchers say.

The finding, based on an analysis of data from NASA's Messenger probe, sheds new light on the formation and history of the mysterious innermost planet, scientists add.

Mercury, the smallest planet in the solar system, is also one of the least understood, having received much less attention from scientific missions than Mars, Jupiter and Saturn. NASA set out to change that when it launched the Messenger probe a little more than eight years ago. Messenger became the first spacecraft to orbit Mercury.