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A NASA rover could be about to tell us whether there is life on Mars and if aliens have ever lived on the mysterious red planet.
The InSight Lander blasted off from California at 12.05pm UK time to unlock the secrets that have been stumping experts for generations.
It is expected to reach its destination in around six months, landing on a broad, smooth plain close to the planet's equator called the Elysium Planitia.
That will put InSight roughly 373 miles (600 km) from the 2012 landing site of the car-sized Mars rover Curiosity.
It will then spend two years - or one Martian year - scouring its surface.
The probe will dig deeper than ever before by plumbing the depths of the planet's interior for clues to how Mars took form and, by extension, the origin of the Earth and other rocky planets.