Astronomers Watch a Quiet Pulsar Suddenly Speed Up

By Space.Fan Editorial DeskSeptember 29, 2026 at 5:00 PM UTC

A star that once seemed perfectly steady has surprised scientists by spinning faster three times.

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The Drop

Pulsars are super-dense s that spin like clockwork. They send out beams of energy that sweep across space, acting like cosmic lighthouses. Most pulsars keep a very steady pace, but sometimes they experience a glitch. A glitch is when a pulsar suddenly speeds up for a short time before slowing back down. Researchers usually expect this from very young s, but this pulsar, named PSR J1637–4642, was thought to be quiet. Scientists used the Murriyang radio telescope at the Parkes Observatory to watch this for over 15 years. From 2009 to 2024, they tracked its steady rhythm. To their surprise, the pulsar did not stay quiet. It suffered three separate glitches, meaning it jumped to a faster spin speed three different times. By measuring the radio signals, the team could calculate exactly how much the pulsar sped up. The first glitch was the biggest, while the other two were much smaller. One of the glitches even caused a permanent change in how the spins. This shows that even s we think are predictable can hide surprising, high-energy events.

Why It Matters

This discovery matters because it proves that even 'quiet' s can have hidden energy deep inside. Pulsars are mostly made of super-dense material that acts like a superfluid, which is a liquid that flows without any friction. These glitches are likely caused by this fluid interacting with the solid crust of the . By studying these sudden speed jumps, scientists can learn what is happening inside the pulsar. The data from these three events helps confirm ideas about how the 's inner parts move. It shows that the has a layer of superfluid trapped beneath its surface, which is a key part of how these massive objects work.

The Catch

While the team has a strong idea of what happened, they are still looking at models to explain the details. The study uses math to guess what is happening inside the based on how it spins, but we cannot actually see inside a pulsar. Because these events are rare and unpredictable, scientists have to wait for more data to know if their models are perfectly correct.

Put That in Perspective

Pulsars are famous for being some of the most precise clocks in the galaxy. For years, astronomers thought this specific star would never glitch because it had been so calm for so long. Finding these three events suggests that many other 'quiet' pulsars might just be waiting for their turn to glitch, prompting researchers to keep a closer eye on them in the future.

Source September 29, 2026

Parkes Observatory·ApJ

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