Nearly 50 years after its 1977 launch, Voyager 1 continues to send data from over 24 billion kilometres away, far beyond the Solar System, making it the most distant human-made object ever. Keeping the ageing spacecraft operational at such extreme distances is challenging, as every signal and unit of power must be carefully managed while its energy steadily declines.
How Voyager-1 Still Works After 49 Years
Voyager 1 does not rely on solar panels like most modern spacecraft. Instead, it uses a nuclear power system called a radioisotope thermoelectric generator (RTG), which converts heat from decaying plutonium into electricity. This allows it to function far beyond the reach of sunlight, where solar power is no longer effective.
However, the RTG gradually loses power over time, with about four watts disappearing each year. After nearly five decades, this steady decline has left the spacecraft with very limited energy, forcing engineers to carefully manage what remains.
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To extend its life, systems are being switched off one by one, including heaters in some areas. While this saves power, it also exposes the spacecraft to extreme cold, which can damage critical components. Careful planning and a long-term shutdown strategy have helped ensure that the most important instruments continue working.
Why a Key Instrument Was Shut Down
On April 17, a significant step was taken to conserve power on Voyager 1 when one of its longest-running instruments, the Low-Energy Charged Particles (LECP) experiment, was switched off. It had been operating almost continuously since the spacecraft’s launch in 1977, making it one of the most durable tools onboard. This move marks an important effort to extend the spacecraft’s remaining life.
The LECP instrument played a key role in studying charged particles such as ions, electrons, and cosmic rays. These observations helped scientists understand conditions in interstellar space, far beyond the Sun’s influence. The data collected over decades has provided valuable insights into how space behaves at extreme distances.
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The decision to shut it down was part of a long-term strategy to manage Voyager 1’s declining power supply. The situation became more urgent after an unexpected drop in power during a routine manoeuvre earlier this year. This raised concerns that systems could begin shutting down unpredictably.
To avoid such risks, engineers carried out a controlled shutdown to keep remaining systems stable. Communication also remains a challenge, as signals take about 23 hours to reach the spacecraft. This delay requires every command to be carefully planned and executed.
What Is Still Working on Voyager-1
Even after shutting down one instrument, Voyager 1 continues to actively collect data from deep space. Two key science instruments remain operational, focusing on plasma waves and magnetic fields in interstellar space. This region exists far beyond the Sun’s influence and represents an environment that no other spacecraft has explored before. The information being transmitted back to Earth is helping scientists understand the structure, behavior, and conditions of space at distances never studied directly until now.
To keep these instruments running, engineers are developing new ways to carefully manage the spacecraft’s limited and steadily decreasing power supply. One of the main strategies under consideration is known as the “Big Bang” approach. Instead of turning off systems gradually over time, this plan involves reconfiguring several systems at once to improve overall energy efficiency and extend the spacecraft’s operational life.
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By reorganising how power is distributed, some systems can be adjusted to use less electricity, while others may be replaced or modified to function on lower power. This delicate balancing act is essential because Voyager 1 is now operating at the very edge of its technical capabilities, where even small energy savings can make a meaningful difference.
Despite these challenges, Voyager 1 continues to function reliably. Its faint signals still reach Earth after long delays, carrying valuable scientific data from a distant and largely unexplored region of space, where direct observation has never been possible before.
