A NASA robotic rover is nearing completion ahead of a journey next year to search for evidence of past life on Mars and lay the groundwork for the space agency's mission to send humans into deep space. The findings of the Mars 2020 research will be crucial to future human missions to the red planet.The Mars 2020 Rover is carrying equipment that can turn carbon dioxide into oxygen and as a propellant.The rover will collect up to 30 soil samples to be picked up and returned to Earth.