This artist's rendering shows NASA's Voyager spacecraft. (Photo:images.nasa.gov/)Nasa engineers have successfully implemented a new power-saving upgrade on Voyager 2, extending the iconic spacecraft’s science mission by at least another year as it continues exploring interstellar space nearly five decades after launch. The US space agency has successfully extended the life of its historic Voyager 2 spacecraft after engineers implemented an ambitious power-saving upgrade known internally as the ‘Big Bang’ fix, allowing the probe to continue collecting scientific data from interstellar space. Voyager 2, currently about 21.35 billion kilometres (13 billion miles) from Earth, is one of the farthest human-made objects in space. Both spacecraft launched in 1977 on missions originally expected to last only five years but have continued operating for nearly half a century.