NASA/JPL-Caltech
Voyager 1 and 2 are exploring the mysterious region between stars, called interstellar space. NASA launched the twin probes in 1977 for a five-year mission to trek across the solar system. It should take Voyager 1 40,000 years to reach another star, according to the space agency.Some 14.8 billion miles from Earth, the Voyager 1 probe is cruising through the blackness of the interstellar...