NASA’s only moon rover, the Resource Prospector, has been canceled despite a recently signed directive encouraging a human return to the moon. The rover would have been responsible for finding hydrogen, oxygen, water, and other compounds that could support future astronauts. The Resource Prospector was being developed as part of the Human Exploration and Operations Mission Directorate. A prototype was field tested in 2015 and underwent vacuum and thermal testing the following year. But recently, Neal said, NASA moved to transfer the project to its Science Mission Directorate, which develops robotic missions for mainly research, rather than exploration, purposes.