Page last updated at 10:50 GMT, Wednesday, 14 May 2008 11:50 UK

'Nail-biting' descent to Mars

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Scientists are preparing for "seven minutes of terror" as a Nasa spacecraft makes a nail-biting descent to the surface of Mars.

The Phoenix lander needs to perform a series of challenging manoeuvres along the way as it attempts to land in the planet's polar north.

It then begins a three-month mission to investigate Mars' geological history and potential habitability.

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