A long-standing discrepancy in the Sun’s chemical composition has been traced to the way its light was interpreted. A new atmospheric model finds that the Sun contains 55% more silver than earlier estimates indicated.
The revised figure brings the Sun’s silver abundance back into agreement with ancient meteorites. Rather than suggesting that silver vanished during solar evolution, the result points to limitations in older modelling.
A Reference Point for Astronomy
The Sun is one of astronomy’s main reference objects for studying stars, planets and cosmic matter. A correction to its chemical inventory can therefore affect how researchers interpret observations beyond the solar system.
Silver is measured through characteristic absorption lines in sunlight. Atoms absorb light at specific wavelengths, leaving spectral signatures that allow astronomers to infer the presence and abundance of individual elements.
That method depends on an accurate description of the stellar atmosphere where the lines form. If the physical conditions are simplified too heavily, the signal can lead to an underestimated elemental abundance.
| Measure | Earlier Interpretation | New Calculation |
|---|---|---|
| Solar silver abundance | Estimated too low | 55% higher |
| Match with ancient meteorites | Discrepancy remained | Agreement restored |
| Solar atmosphere treatment | Simplified model | More realistic dynamic model |
Why Earlier Models Fell Short
The outer layers of the Sun are turbulent and continuously changing. Earlier atmospheric models did not fully represent that complexity or calculate the interaction between silver atoms and surrounding light with sufficient precision.
This affected how the silver spectral signal was read. The weakness was not evidence of a shortage of silver in the Sun, but an indication that the reading method required refinement.
A research team led by Sema Caliskan of Uppsala University in Sweden applied a more detailed atmospheric calculation. The work re-examined how silver atoms interact with light in the Sun’s moving outer atmosphere.
Ancient Meteorites Provide the Comparison
The Sun and ancient meteorites are believed to have formed from the same giant cloud of gas and dust about 4.6 billion years ago. Their compositions are therefore important tools for investigating the early solar system.
Ancient meteorites are regarded as natural time capsules that preserve traces of that original material. Previous solar measurements repeatedly returned lower silver values than those suggested by these primitive objects.
The new calculation is sufficient to close that gap. It restores consistency between the Sun and meteorites without requiring a scenario in which the Sun lost silver over time.
Potential Use Beyond the Sun
The study was published in Astronomy & Astrophysics, according to Media Indonesia. Its success with the Sun provides a basis for applying similar modelling to stars of different ages and types.
“This new knowledge about the composition of the Sun is very important for understanding stars, planets, and other cosmic matter, because the Sun is one of the main reference points in astronomy,” said Sema Caliskan, the study’s lead author. The statement underscores the broader value of improving the solar abundance scale.
Researchers expect more accurate stellar comparisons to help trace how silver formed in the universe. They also aim to understand how this heavy element spread through the Milky Way over cosmic history.