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Last Updated: Monday July 20 2009 13:39 GMT

When will a person walk on Mars?

Mars

Nasa, the US space agency, has said it aims to send a person to the Moon by 2020.

But lots of people want that aim to change to Mars, and Nasa may change their mind. So we may soon be seeing human footprints on the red planet.

In 2003 Mars made its closest approach to Earth for 17 years. Several unmanned spacecraft were sent to Mars, including Europe's Mars Express mission.