NASA’s Voyager 1 is continuing its journey beyond our solar system, 45 years after it was launched. But now the veteran spacecraft is sending back strange data, puzzling its engineers.

NASA said on Wednesday that while the probe is still operating properly, readouts from its attitude articulation and control system — AACS for short — don’t seem to match the spacecraft’s movements and orientation, suggesting the craft is confused about its location in space. The AACS is essential for Voyager to send NASA data about its surrounding interstellar environment as it keeps the craft’s antenna pointing right at our planet.

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