There was a gap. For years, astronomers looked at the Sun’s outer layers and found significantly less silver than expected. It wasn’t a little deficit. It was a discrepancy. The numbers didn’t add up.
Where did the missing silver go?
New research suggests it wasn’t missing at all. It was hiding in plain sight.
Why search for silver in the Sun?
You might wonder why anyone cares about silver in a star made of 98.5% hydrogen and helium. The remaining 1.5% is where the history lives. This fraction contains traces of iron, copper, and heavier elements.
These elements are time capsules.
Silver, for instance, forms when dying stars explode as supernovas. Finding silver in the Sun allows scientists to trace the cosmic timeline. It helps map how heavy elements have been distributed throughout the Milky Way.
“By studying the light of stars of different Types and ages, we hope to understand where Silver is formed in the Universe,” says Sema Caliskan. She is the lead author of the study and now a postdoctoral researcher at the University of Liège.
The CI chondrite mismatch
The standard for comparison is ancient meteorites known as CI chondrites.
These rocks formed from the same primordial cloud that created the Sun 4.6 billion years ago. Logic dictates that breaking open a CI chondrite should reveal silver levels matching the Sun. If the Sun is missing silver, something is wrong.
Astronomers usually measure solar composition by looking at spectral lines. Light travels from the Sun’s core, hits atoms in the outer layers, and gets absorbed at specific wavelengths. The result is a spectrum of light with dark lines. Each element leaves a unique fingerprint.
Past models pored over these fingerprints. They saw the lines. They calculated the quantities. And they found a deficit.
The Sun simply didn’t have enough silver to match the meteorites.
The non-equilibrium effect
Caliskan and her team questioned the methods. They couldn’t touch the Sun, so they simulated it. They built high-silver computer models to see if they could produce the observed low-silver spectral lines.
Previous attempts failed because they were too simple.
When light strikes an atom, complex effects occur deep inside the atom. These change how light is absorbed. Past simulations ignored what are called “non-equilibrium effects.” Simulating them is messy. It’s computationally expensive. Different atoms behave differently.
No one had successfully simulated a silver atom with these non-equilibrium effects before. Caliskan’s team used the Tetralith supercomputer in Sweden to tackle the problem.
The result changed the picture.
The missing silver revealed
The non-equilibrium effects explain the discrepancy.
Caliskan’s model indicates the Sun holds 55% more silver than previously measured. This isn’t a perfect 1:1 match with CI chondrites, but it’s close. It’s close enough to rule out exotic causes or lost stars.
The silver was there all along.
Astronomers just couldn’t see it clearly because of complex atomic physics occluding the signal. The mystery wasn’t a missing element. It was a measurement blind spot.
Next, the team will apply this method to other star types. The Sun’s silver mystery may be closed, but the universe has plenty of other things hiding in its light.
