Enlarge / An artist's rendering of the Nova-C spacecraft on the lunar surface. (credit: Intuitive Machines) A Houston-based company that is one of several US firms building private lunar landers, Intuitive Machines, says its 3-meter-tall Nova-C lander is finally ready to take to the skies. "Our Nova-C lander is completely built," said Steve Altemus, co-founder and chief executive of Intuitive Machines, in an earnings call on Monday.