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Scientists Discover Way to Send Information into Black Holes Without Using Energy

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Astronomers Discover an Ancient Hypervelocity Star Racing Out of the Milky Way

In a remarkable discovery that deepens our understanding of the universe, Chinese astronomers have identified a rare and fascinating object—a star moving so fast that it may eventually escape our galaxy. Named DESI-HVS1, this star is not just unusual because of its speed, but also because of its age and composition. The finding, based on observations from the Dark Energy Spectroscopic Instrument (DESI) and the Gaia satellite, was published on April 23 on the arXiv preprint server.

This discovery offers new clues about how stars behave in extreme environments and how powerful forces at the center of our galaxy can send them flying into deep space.

What Are Hypervelocity Stars?

Hypervelocity stars (HVSs) are among the fastest-moving stars in the universe. While most stars orbit calmly within their galaxies, these stars travel at extraordinary speeds—typically more than 500 kilometers per second. At such velocities, they can break free from the gravitational pull of their home galaxy.

To put this into perspective, our Sun moves around the Milky Way at about 220 kilometers per second. Hypervelocity stars move more than twice as fast.

The main explanation for these speeds is something called the Hills mechanism. This occurs when a pair of stars (a binary system) gets too close to a supermassive black hole. The intense gravity tears the pair apart—one star gets captured, while the other is flung outward at incredible speed, like a cosmic slingshot.

Why the Galactic Center Matters

The center of the Milky Way is one of the most extreme regions in our galaxy. It contains a supermassive black hole with a mass millions of times that of the Sun. This region is crowded with stars, dust, and powerful gravitational forces, making it a hotspot for dynamic interactions.

Because of these conditions, astronomers believe the galactic center is the primary birthplace of hypervelocity stars. However, proving that a star actually came from this region is very challenging. Scientists must carefully trace the star’s motion backward in time, which requires highly accurate data about its position and velocity.

This is where advanced tools like DESI and Gaia play a crucial role. Gaia provides extremely precise measurements of star positions and motions, while DESI adds detailed information about their physical properties.

Meet DESI-HVS1: A Rare Discovery

The newly discovered star, DESI-HVS1, stands out for several reasons. Unlike most previously known hypervelocity stars—which tend to be young and massive—this star is old, lightweight, and poor in heavy elements.

It is classified as an F-type star, meaning it is slightly hotter than the Sun. But what truly makes it special is its combination of features:

  • Distance from Earth: About 12,300 light-years

  • Speed: Around 523 km/s (close to escape velocity)

  • Mass: About 0.76 times that of the Sun

  • Temperature: Approximately 6,198 K

  • Metallicity: Very low (–1.64 dex, meaning it lacks heavy elements)

  • Age: Around 14.1 billion years

This age is particularly striking—it suggests the star formed very early in the history of the universe.

A Journey from the Galactic Center

By analyzing its motion, astronomers found that DESI-HVS1 is moving away from the inner regions of the Milky Way and heading outward. When they traced its path backward, they discovered something remarkable.

About 12.9 million years ago, the star passed within roughly 1,300 light-years of the galactic center. At that time, it was likely ejected at a speed of around 682 km/s.

Its trajectory shows a clean, simple path—what scientists call a “ballistic orbit.” This means it has not been significantly disturbed by other gravitational forces since its ejection. It also crossed the plane of the galaxy only once, further supporting the idea that it originated near the center.

Why This Discovery Matters

DESI-HVS1 is not just another fast-moving star—it represents a new category of hypervelocity stars. Until now, most confirmed HVSs were young and massive. This discovery shows that older, low-mass stars can also be ejected from the galactic center.

This has several important implications:

1. Expanding Our Understanding of Stellar Populations

The discovery suggests that the galactic center may eject a wider variety of stars than previously thought.

2. Insights into Galactic Dynamics

Studying hypervelocity stars helps astronomers understand the behavior of the supermassive black hole and the complex interactions happening near it.

3. Clues About the Early Universe

Because DESI-HVS1 is metal-poor and very old, it provides a glimpse into the conditions of the early universe, when heavy elements were scarce.

The Role of Modern Astronomy Tools

This discovery would not have been possible without the combined power of modern observational tools.

  • DESI collects detailed spectra of stars, helping scientists determine their composition, temperature, and velocity.

  • Gaia measures the precise positions and motions of over a billion stars, allowing astronomers to track their paths through space.

Together, these instruments enable researchers to reconstruct the life stories of stars with unprecedented accuracy.

Challenges in Confirming Origins

Even with advanced data, confirming the exact origin of a hypervelocity star is not easy. Small uncertainties in distance or motion can lead to large errors when tracing a star’s path backward over millions of years.

That’s why only a handful of hypervelocity stars have been confidently linked to the galactic center. DESI-HVS1 is currently considered a strong candidate, and further observations will help confirm its origin.

A Glimpse into the Future

If confirmed, DESI-HVS1 will become the first known example of an old, low-mass, metal-poor star ejected from the galactic center. This could lead to a new wave of research focused on finding similar stars.

Astronomers may begin to search more carefully for older hypervelocity stars that were previously overlooked. With improved data and future missions, we may soon discover many more stars like DESI-HVS1.

Conclusion

The discovery of DESI-HVS1 is a powerful reminder of how dynamic and surprising our universe can be. A star formed billions of years ago, quietly orbiting in the Milky Way, was suddenly launched on a high-speed journey by the immense gravity of the galactic center.

Now, it races through space, carrying with it clues about the past, the structure of our galaxy, and the extreme forces that shape it.

As technology continues to improve, discoveries like this will not only answer old questions—but also raise new ones, pushing the boundaries of our understanding even further.

Reference:
Shunhong Deng et al., An Old, Low-mass, Metal-poor Hypervelocity Star Candidate Consistent with a Galactic Center Origin, arXiv (2026).

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