Thruster Activity Started in NASA Voyager

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A set of thrusters aboard the Voyager 1 spacecraft successfully fired up after 37 years without use.

Voyager 1, NASA’s farthest and fastest spacecraft, is the only human-made object in interstellar space, the environment between the stars.

The spacecraft, which has been flying for 40 years, relies on small devices called thrusters to orient itself so it can communicate with Earth. These thrusters fire in tiny pulses, or “puffs,” lasting mere milliseconds, to subtly rotate the spacecraft so that its antenna points at our planet.

Now, the Voyager team is able to use a set of four backup thrusters, dormant since 1980.

Since 2014, engineers have noticed that the thrusters Voyager 1 has been using to orient the spacecraft, called “attitude control thrusters,” have been degrading. Over time, the thrusters require more puffs to give off the same amount of energy. At 13 billion miles from Earth, there’s no mechanic shop nearby to get a tune-up.

In the early days of the mission, Voyager 1 flew by Jupiter, Saturn, and important moons of each.

All of Voyager’s thrusters were developed by Aerojet Rocketdyne. The same kind of thruster, called the MR-103, flew on other NASA spacecraft as well, such as Cassini and Dawn.

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