Enlarge / NASA has three Deep Space Network stations in California, Spain, and Australia, collectively tracking dozens of space missions. (credit: NASA/Bill Ingall's) NASA officials sounded an alarm Tuesday about the agency's Deep Space Network, a collection of antennas in California, Spain, and Australia used to maintain contact with missions scattered across the Solar System. Everything from NASA's Artemis missions to the Moon to the Voyager probes in interstellar space rely on the Deep Space Network (DSN) to receive commands and transmit data back to Earth.