Voyager 1 reached interstellar space in August 2012 and is the most distant human-made object in existence. Launched just shortly after its twin spacecraft, Voyager 2, in 1977, Voyager 1 explored the Jovian and Saturnian systems discovering new moons, active volcanoes and a wealth of data about the outer solar system.
Voyager 1 and 2 were designed to take advantage of a rare planetary alignment that occurs only once in 176 years and remain the most well traveled spacecraft in history. Both spacecraft carry a sort of time capsule called the Golden Record, a 12-inch gold-plated copper disk containing sounds and images selected to portray the story of our world to extraterrestrials.
I presume that vast majority of people that were building software for this missions are now retired, but in last 35 years programming, programming languages advanced so far.
So, it launched in 1977. After 35 years, Voyager reached interstellar space. How many lines of code are there and in what language is it written? What was development process behind this missions (that are still active)?.
So, what was the greater plan with code in this mission, and in which language is code base written?