NASA's Insight Lander: What can Mars teach us about our planet?

After a six-month space cruise, NASA's latest Mars mission is set to arrive at the Red Planet on Monday with a single goal: explore its deep insides. InSight Lander - the Interior Exploration using Seismic Investigations, Geodesy and Heat Transport - is the US space agency's first craft dedicated to peer beneath Mars' surface and study its interior. Its landing, at around 20:00 GMT, will make it the first US robot to visit the planet since Curiosity in 2012. But this is far from an easy feat - of the 44 missions sent to Mars, only 18 have been successful. Here's everything you need to know about the spacecraft, its landing and the information it has set out to gather.