A "zombie satellite" that spent months sending out signals while it was adrift in orbit has sprung back to life, resetting itself after its unexplained breakdown in space earlier this year.

"The most critical phases of Galaxy 15's recovery have been successfully completed," officials at Intelsat, the communications provider that owns the satellite, said of the newly responsive satellite.

The Galaxy 15 communications satellite lost contact with its flight control center in April. But in an unexpected twist, the stricken satellite's telecommunications broadcast package remained in operation. With Intelsat operators unable to control the solar-powered satellite, Galaxy 15 continued to transmit signals, posing a risk of interfering with the signals of neighboring satellites. [Worst Space Debris Moments in History]