Children lie down and pose as rocks on mars as a a model rover rolls over them during the JPL open house on Sunday, October 11, 2015 in Pasadena, Calif. The open house was held on both Saturday and Sunday and included exhibits including a life-size model of the Curiosity Mars rover; demonstrations from numerous space missions; JPL’s machine shop, where robotic spacecraft parts are built; and the Microdevices Lab, where engineers and scientists use tiny technology to revolutionize space exploration.