In 2009, three spacecraft traveled to the moon in search of water. In the earliest study, scientists examined the lunar surface in infrared and found H2O. Key to their discovery was the use of the Stratospheric Observatory for Infrared Astronomy, or SOFIA, a telescope installed on a Boeing 747's fuselage. The craft was operated by NASA and the DLR, Germany's Aerospace Center. "The detection is very unique for molecular water," Shuai Li, a planetary scientist at the University of Hawaii told CNET. "Based on our knowledge, it cannot be anything else," he said.