Meteorites typically include metals such as magnesium, silicon, and iron, and iron substances were formerly hypothesized to be absorbers. The magnesium and silicon discovered in meteorites are awful absorbers of UV radiation. Iron was more appealing; Venera and the Vega probes had actually identified climatic iron, while the mass spectrometer aboard the Pioneer Venus Large Probe discovered the substance iron sulfate, however these discoveries avoided description for years.

Remaining suspicions that iron substances were the mystical absorber were validated when scientists discovered that iron sulfate matched the haze’s residential or commercial properties.

It ends up that for haze particles at a specific height (40 to 50 km or about 25 to 31 miles above the surface area), condensation is not possible since the high energy of the particles produces a barrier that does not permit beads of sulfuric acid to stay with their surface area. (This is called a nucleation barrier.) Particles with a strong nucleation barrier are required to the upper cloud layer by hotter air increasing in the procedure of convection, where they cool enough to be integrated into sulfuric acid particles. While previous observations had actually recommended this, Karyu’s group now has more powerful proof.

This discovery has ramifications for other worlds. Upper hazes on gas giants have actually been studied advertisement nauseam, however microphysical procedures below the primary cloud layer stay an enigma. Venus might have clarified a minimum of a few of the tricks of haze. On a world like Jupiter, it may be that particles that can not vaporize, like those from meteorites, decide on the external layers of clouds. Additional research studies might offer more insight into how cosmic dust promotes cloud and haze development on worlds like Jupiter, Saturn, and Neptune.

“As on Venus, observing the metal layers in the environment of the external worlds would assist [determine] the deposition rates of [metals] within their environments and, by extension, the resulting haze abundances,” stated Karyu. “These impacts develop cosmic dust as an important part of planetary environments, a function that is likewise most likely to be crucial for exoplanets.”

Nature Astronomy, 2026. DOI: 10.1038/ s41550-026-02843-4