NASA spacecraft embarks on historic journey into interstellar space

NASA's Voyager 1 spacecraft officially is the first human-made object to venture into interstellar space. The 36-year-old probe is about 12 billion miles (19 billion kilometers) from our sun. New and unexpected data indicate Voyager 1 has been traveling for about one year through plasma, or ionized gas, present in the space between stars.

Voyager spaceship 'hijacked by aliens'

A German UFO buff is suggesting that NASA's Voyager 2 spacecraft may have been hijacked by aliens.