Rare meteorite hopes to unravel the secrets of Mars

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A Martian meteorite, an incredibly rare object, has been given to science to help unravel the Red Planet's secrets.

The Natural History Museum in London has acquired a 1kg piece of the Tissint rock thanks to an anonymous benefactor.

It was seen to land in Morocco last July and retrieved quickly, resulting in minimal contamination with Earth.

The BBC's Pallab Ghosh reports.

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