Cosmic dust creates the mysterious haze on Venus

Researchers at Tohoku University in Sendai City, Japan, have identified the true nature of the yellowish layer found in the lower atmosphere of Venus. Using a microphysical model, a team led by planetary scientist Hiroki Karyu determined that this long-unexplained haze consists of cosmic dust. This material originates from meteorites that burn up during atmospheric entry. When these particles interact with sulfuric acid, they create the persistent haze first observed by the Pioneer Venus and Venera probes during the 1970s.

The study, published in Nature Astronomy, confirms that the steady arrival of space debris provides enough material to maintain the observed particle distribution. These cosmic particles serve as essential condensation nuclei for the planet's atmospheric processes. This discovery provides a definitive explanation for data collected by early spacecraft that remained a mystery for several decades.