Mars probe set for risky descent

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 will begin its plunge through the Martian atmosphere on 25 May (GMT) as it attempts to land in the planet's polar north.
The craft needs to perform a series of challenging manoeuvres along the way.
It then begins a three-month mission to investigate Mars' geological history and potential habitability.

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