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Astronomers build galaxy-sized ‘detector’ to map universe’s vibrations
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Astronomers build galaxy-sized ‘detector’ to map universe’s vibrations Premium

The Hindu
Wednesday, January 1, 2025 12:41 AM GMT

Scientists have confirmed earlier reports that the fabric of the universe is constantly vibrating. The background rumble is likely caused by collisions between the enormous black holes that reside in the hearts of galaxies

Using the largest gravitational wave detector ever made, we have confirmed earlier reports that the fabric of the universe is constantly vibrating. This background rumble is likely caused by collisions between the enormous black holes that reside in the hearts of galaxies.

The results from our detector – an array of rapidly spinning neutron stars spread across the galaxy – show this “gravitational wave background” may be louder than previously thought. We have also made the most detailed maps yet of gravitational waves across the sky, and found an intriguing “hot spot” of activity in the Southern Hemisphere.

Our research is published today in three papers in the Monthly Notices of the Royal Astronomical Society.

Gravitational waves are ripples in the fabric of space and time. They are created when incredibly dense and massive objects orbit or collide with each other.

The densest and most massive objects in the universe are black holes, the remnants of dead stars. One of the only ways to study black holes is by searching for the gravitational waves they emit when they move near each other.

Just like light, gravitational waves are emitted in a spectrum. The most massive black holes emit the slowest and most powerful waves – but to study them, we need a detector the size of our galaxy.

The high-frequency gravitational waves created by collisions between relatively small black holes can be picked up with Earth-based detectors, and they were first observed in 2015. However, evidence for the existence of the slower, more powerful waves wasn’t found until last year.

Read full story on The Hindu
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