What color is the sky on Mars? How long is a Martian year? In this red planet primer, experts answer the fundamental questions on all things Mars. #MARS | National Geographic TV

Question of the day: If our NASA InSight lander is traveling at 14,000 mph and has only 6 minutes to slow down before it reaches the Martian surface, what is required for it to land safely? See how our engineers at NASA Langley Research Center tackled this question and more: https://go.nasa.gov/2HQpVVG. | NASA - National Aeronautics and Space Administration