Mars rover Perseverance will face "seven minutes of terror" before landing on the red planet.The space probe will be making its final, self-guided descent to Mars on Thursday, with engineers warning: "Success is never assured."Al Chen, head of the descent and landing team at NASA's Jet Propulsion Laboratory, called it the most critical and dangerous part of the expensive $2.7billion mission (£1.94m).The six-wheeled rover is expected to take seven minutes to descend from the top of the Martian atmosphere to the planet's surface in less time than the 11-minute radio transmission back to Earth.He said: "Success is never assured.
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