I've lost my bank card amitriptyline 25mg Lansdorp believes the human mission to Mars would cost as little as $6bn, but Michael Listner, an expert on space law has put the total bill at closer to $1tn. Most of the cost must be paid for by philanthropists, sponsorship, and broadcast rights: the Mars One business model turns space travel – and a real risk of death – into a reality TV show that will follow the astronauts through their mission.