{"id":209765,"date":"2025-12-25T05:14:15","date_gmt":"2025-12-25T05:14:15","guid":{"rendered":"https:\/\/www.newsbeep.com\/ie\/209765\/"},"modified":"2025-12-25T05:14:15","modified_gmt":"2025-12-25T05:14:15","slug":"scientists-suddenly-cant-explain-how-stellar-winds-spread-the-seeds-of-life-throughout-the-cosmos","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/ie\/209765\/","title":{"rendered":"Scientists Suddenly Can’t Explain How Stellar Winds Spread the Seeds of Life Throughout the Cosmos"},"content":{"rendered":"

New observations from scientists at Sweden\u2019s Chalmers University of Technology have cast doubt on the long-held idea that light from dying stars<\/a> propels \u2018seeds of life\u2019<\/a> molecules like oxygen<\/a> and carbon<\/a> throughout the cosmos.<\/p>\n

The new study, which found that the propulsive power of starlight<\/a> and stardust<\/a> emitted by red giant stars<\/a> was insufficient to allow the seeds of life molecules to escape their host star\u2019s gravitational pull<\/a>, has resulted in a new astronomical mystery for scientists to solve.<\/p>\n

\u201cWe thought we had a good idea of how the process worked,\u201d explained Chalmers astronomer Theo Khouri, the joint leader of the study detailing the newly discovered mystery. \u201cIt turns out we were wrong. For us as scientists, that\u2019s the most exciting result.\u201d<\/p>\n

Seeds of Life Findings Create All New Stardust Mystery<\/p>\n

Although researchers have yet to find irrefutable evidence of life beyond Earth<\/a>, most agree that the seeds of life molecules needed for Earth\u2019s biological life to exist and thrive were born in the heart of stars. For the last several decades, most scientists have been relatively confident that these molecules and other critical life-supporting elements<\/a> have been propelled by stellar winds aboard grains of dust into the depths of the cosmos, where they could seed the formation of new planets<\/a>, and, potentially, life.<\/p>\n

Described as the \u201ccooler cousins\u201d of the Sun, red giants lose massive amounts of material through the phenomenon of stellar winds. Although likely critical for the theoretical spread of life throughout the cosmos, the team said the exact mechanism that drives these winds \u201chas remained uncertain.\u201d<\/p>\n

To better understand the process, the Chalmers scientists focused on a red giant star, R Doradus, only 180 light-years away in the constellation Dorado. Although the cosmically close dying star once had a relatively similar mass to the Sun, R Doradus now loses about one-third of Earth\u2019s mass every decade.<\/p>\n

The research team said this process is characteristic of asymptotic giant branch (AGB) stars, which \u201close their outer layers to interstellar space,\u201d via stellar winds made of gas and dust. When our sun reaches the end of its life, billions of years from now, it is expected to turn into this category of dying stars.<\/p>\n

\u201cR Doradus is a favourite target of ours \u2013 it\u2019s bright, nearby, and typical of the most common type of red giant,\u201d Khouri explained.<\/p>\n

World\u2019s \u2018Best\u2019 Telescopes Shed Light on Stellar Winds<\/p>\n

The first step in the process involved measuring starlight reflected by tiny grains of stardust surrounding R Doradus. Due to the minute amount of light that the team was hoping to detect, they were granted access to the Spectro-Polarimetric High-contrast Exoplanet Research (SPHERE) instrument mounted on the European Space Agency\u2019s (ESA) Very Large Telescope VLT) in Chile.<\/p>\n

\u201cUsing the world\u2019s best telescopes, we can now make detailed observations of the closest giant stars,\u201d Khouri said.<\/p>\n

After successfully analyzing polarized light at different wavelengths, the team made several discoveries. For example, SPHERE detected light signatures consistent with dust grains surrounding the star. The Chalmers team said the data also revealed the size and composition of the grains were \u201cconsistent with common forms of stardust,\u201d including silicates and alumina.<\/p>\n

Next, the researchers combined the real-life telescope data with computer simulations designed to model the interaction between stardust and starlight. Study co-author Thi\u00e9baut Schirmer said these comparisons represented the first stringent tests intended to confirm whether grains of dust that include seeds of life molecules \u201ccan feel a strong enough push from the star\u2019s light.\u201d<\/p>\n

Results Show Light is Not Enough, but Opens \u201cExciting Alternatives\u201d to Explore<\/p>\n

After comparing the data, the team said the push from starlight was \u201cnot enough\u201d to push the stardust grains into interstellar space. That\u2019s because most of the grains surrounding R Doradus were only about one ten-thousandth of a millimeter across. The research team said this made the grains \u201ctoo small for starlight alone\u201d to propel them into interstellar space.<\/p>\n

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\u201cDust is definitely present, and it is illuminated by the star,\u201d Schirmer explained. \u201cBut it simply doesn\u2019t provide enough force to explain what we see.\u201d<\/p>\n

While the new findings seem to contradict the traditional explanation, the team said their research points to \u201cmore complex processes\u201d behind the phenomenon. Study co-author and Chalmers professor Wouter Vlemmings agreed, noting that even though the simplest explanation appears incorrect, their findings have uncovered \u201cexciting alternatives to explore\u201d moving forward.<\/p>\n

One possible explanation for the dispersal of such molecules involves images of enormous convective bubbles rising and falling over R Doradus\u2019 surface, previously captured by the same team. Vlemmings suggested that it\u2019s possible these stellar pulsations could enhance the push of starlight enough to drive the seeds of life into interstellar space. The scientist also suggested that something unexpected, such as dramatic episodes of stardust formation, might combine with the other phenomena, which \u201ccould all help explain how these winds are launched\u201d into the cosmos.<\/p>\n

The study \u201cAn empirical view of the extended atmosphere and inner envelope of the asymptotic giant branch star R Doradus<\/a>\u201d was published in Astronomy and Astrophysics.<\/p>\n

Christopher Plain is a Science Fiction and Fantasy novelist and Head Science Writer at The Debrief. Follow and connect with him on X<\/a>, learn about his books at plainfiction.com<\/a>, or email him directly at christopher@thedebrief.org<\/a>.<\/p>\n

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