Nasa to send new rover to Mars

The US space agency (Nasa) says it will launch a new rover to Mars in 2020. 

The vehicle will be based on its Curiosity robot, which landed on the Red Planet in August.
Nasa expects to re-use many of the technologies that worked so successfully in getting the one-tonne spacecraft down into the huge equatorial bowl known as Gale Crater.

This included a rocket-powered crane that lowered Curiosity to the surface on nylon cords.
The announcement of a follow-up robot was made at the American Geophysical Union (AGU) Fall Meeting in San Francisco, the world's largest annual gathering for Earth and planetary scientists, and a major showcase for Nasa-led research.

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