NASA Finds Young Stars Dim in X-rays Faster Than Expected

The quieting of young stars could be a boon for the prospects of life on orbiting planets.

Apr. 14, 2026 at 8:34pm

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A bold, abstract painting in soft greens, blues, and ochres depicting the complex energy dynamics and structural order of a young star system, visualizing the rapid dimming of X-ray radiation from these stars over time.New research reveals that young stars like our Sun quiet down in high-energy X-ray output much faster than previously understood, a positive development for the prospects of life on orbiting planets.Huntsville Today

Scientists have found that young stellar cousins of our Sun are calming down and dimming more quickly in their X-ray output than previously thought, according to a new study using NASA's Chandra X-ray Observatory. This quieting of young stars is a benefit for the prospects for life on orbiting planets around these stars, as large amounts of X-rays can erode a planet's atmosphere and prevent the formation of molecules necessary for organic life.

Why it matters

Unlike in the new movie 'Project Hail Mary,' this natural 'quieting' of young Sun-like stars in X-rays is not because an outside force is consuming their light, but because their internal generation of magnetic fields becomes less efficient over time. This could be a boon for the formation of life on planets around stars that are younger versions of our own Sun, as high levels of X-rays can be detrimental to the development of life.

The details

Astronomers used Chandra and other telescopes to monitor how powerful radiation from young stars — often in the form of dangerous X-rays — can impact planets surrounding them. They found that Sun-like stars in eight clusters between the ages of 45 million and 750 million years old unleashed only about a quarter to a third of the X-rays they expected. The researchers think the process that generates magnetic fields in these stars may become less efficient, leading to the stars becoming quieter in X-rays more quickly as they age.

  • The study looked at star clusters between 45 million and 750 million years old.
  • Our Sun is about 4.6 billion years old, significantly older than the stellar cousins in this study.

The players

Konstantin Getman

The lead author of the new study from Penn State University.

Vladimir Airapetian

A co-author of the study from NASA's Goddard Space Flight Center in Greenbelt, Maryland.

Eric Feigelson

A co-author of the study from Penn State University.

Chandra X-ray Observatory

NASA's space telescope used to monitor the X-ray output of young stars.

Gaia

The European Space Agency's satellite that provided data to help identify the stars that were members of the clusters.

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What they’re saying

“While science fiction – like the microbes in Project Hail Mary – imagines alien life that dims stellar output by consuming its energy, our real observations reveal a natural 'quieting' of young Sun-like stars in X-rays. This is not because an outside force is consuming their light, but because their internal generation of magnetic fields becomes less efficient.”

— Konstantin Getman, Lead author of the study

“It's possible that we owe our existence to our Sun doing the same thing, several billion years ago, that we see these young stars doing now. This real-world dimming echoes the dramatic stellar change in fiction, but it may be even more fascinating because it highlights our own Sun's actual history.”

— Vladimir Airapetian, Co-author of the study

“We can only see our Sun at this current snapshot in time, so to really understand its past we must look to other stars with about the same mass. By studying X-rays from stars that are hundreds of millions of years old, we have filled in a large gap in our understanding of their evolution.”

— Eric Feigelson, Co-author of the study

What’s next

The researchers will continue to look at the cause of this slower-than-expected activity in young Sun-like stars and investigate potential reasons for the rapid dimming of their X-ray output.

The takeaway

This study highlights how the natural 'quieting' of young stars in X-rays, as their internal magnetic field generation becomes less efficient over time, could actually be a benefit for the prospects of life on orbiting planets. This real-world observation provides insights into the history of our own Sun and the conditions that may have been favorable for the development of life on Earth.