Earth is a living, dynamic world thanks to volcanoes and the planetary heat that fuels them. The InSight mission wants to see if Mars also has a heartbeat deep inside its cold exterior.

Space missions often defy the odds, overcoming all obstacles. The people who work on these missions also face challenges to get where they are today. Marleen Martinez Sundgaard, the testbed lead for InSight, personifies this tenacious spirit.

The Earth "rings" when earthquakes strike, just as vibrations through a bell create a ringing sound. The InSight mission will see if tremors cause Mars to chime with its own planetary song.

Many spacecraft have died trying to get to Mars. The current record for Mars missions is 18 successes, and 25 failures. The InSight mission hopes to improve the odds.

Eight stories, one mission to outer space. “On a Mission,” a new podcast from NASA’s Jet Propulsion Laboratory, launches October 29.