The Voyager spacecraft will probably last a billion years, says a scientist on the mission for nearly five decades

• Alan Cummings has worked on the Voyager mission for over 50 years.
• Since their launch, the two Voyager spacecraft have made breakthrough discoveries that keep Cummings engaged.
• Cummings thinks they will continue traveling for a billion years.

The twin Voyager spacecraft launched almost five decades ago, and there's no reason they shouldn't keep going for a billion years, one of its scientists, Alan Cummings told Business Insider.