Mars Reconnaissance Orbiter
The robotic arm's first movement was delayed by one day when, on May 27, 2008, commands from Earth were not relayed to the "Phoenix" lander on Mars. The commands went to NASA's Mars Reconnaissance Orbiter as planned, but the orbiter's Electra UHF radio system for relaying commands to "Phoenix" temporarily shut off. Without new commands, the lander instead carried out a set of backup activities. On May 27 the Mars Reconnaissance Orbiter relayed images and other information from those activities back to Earth.