By Shreyanka Nandan
NASA’s Voyager 1 spacecraft, launched in 1977, has been travelling through space for nearly 48 years and continues to beam back valuable scientific data from the outer edges of our solar system and beyond a true testament to long-lasting engineering. It operates using three specialised computer units: one for flight control, another for command and sequencing, and a third for managing scientific data.
It was lifted from Cape Canaveral on September 5, 1977, as part of a twin-spacecraft mission to study the outer Solar System and the interstellar space beyond the sun’s heliosphere. It communicates through NASA Deep Space Network (DSN) to receive routine commands and to transmit data to Earth.
At the time, the most advanced calculators in schools were bulky, expensive, and far less powerful than the spacecraft’s computers, which themselves carried less processing capacity than a modern digital watch and total memory of just 69 kilobytes. It’s about one-fiftieth of a single WhatsApp image of today.
After completing its planetary tour, Voyager 1 continued on a trajectory that would take it beyond the gravitational influence of the Sun’s planets. In 2012, it became the first human-made object to enter interstellar space, crossing a boundary known as the heliopause, where the solar wind gives way to the cosmic winds of deep space.
Operating billions of kilometers from Earth, Voyager 1 still communicates via NASA’s Deep Space Network, albeit with signals that take over 22 hours to travel one way. Its instruments measure cosmic rays, magnetic fields, and plasma waves, offering an unprecedented window into the space between the stars. Voyager 1 does not have the facility of instant updates like the calculator or smartphone. Every command of it travels more than 15 billion miles which takes about 22.5 hours to arrive, and the same to hear back.
What makes its endurance even more remarkable is the technology onboard. The spacecraft relies on an eight-track tape recorder, a 3.7-meter-high-gain antenna, and computers programmed in assembly language. Power comes from three radioisotope thermoelectric generators (RTGs) that convert heat from decaying plutonium-238 into electricity, a supply that is expected to last until around 2030, when most instruments will likely be turned off.
Alongside its scientific mission, Voyager 1 carries the Golden Record, a 12-inch gold-plated copper disc containing images, sounds, and music from Earth, intended as a message to any extraterrestrial intelligence that might encounter it.
As it drifts deeper into interstellar space, Voyager 1’s journey is both a scientific triumph and a poetic reminder of humanity’s desire to explore. Nearly half a century later, a spacecraft with less computing power than a pocket calculator continues to inspire, proving that sometimes the most enduring missions are also the most humble in design.
When the power runs out, Voyager 1 stops transmitting, but it keeps drifting silently through the galaxy for millions of years, carrying the Golden Record, a message from humanity.