The craft — one of twin spacecraft sent to explore distant planets — is cruising through interstellar space.
Voyager I, an unmanned craft which has traveled over 11 billion miles from the sun since its launch on Sept. 5, 1977, turned 36 this month. (Its twin spacecraft, Voyager 2, celebrated its 36th on Aug. 20.) Voyager 1 was originally sent to observe Saturn and Jupiter, and is now beyond the fringes of the solar system. NASA via AP Buy Photo