World News America

Page last updated at 23:34 GMT, Monday, 21 February 2011

Answering the mysteries of Mercury


Laura Trevelyan talks to Michio Kaku, author of "Physics of the Future", about a Nasa mission in which a spacecraft will enter orbit around the planet Mercury for the very first time.

Kaku talks about some of the mysteries that could be revealed and what they say about Earth.

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