A team of researchers has succeeded in developing a mathematical and computer model that explains, for the first time, the mechanism behind the appearance of a massive, thin cloud extending over 1,000 miles above the planet Mars, a phenomenon that has puzzled scientists since it was observed by a space probe in 2018.
This cloud, scientifically known as the Arsia Mons Extended Cloud (AMEC), forms repeatedly every morning during the Martian spring and summer seasons near the Arsia Mons volcano, where it gradually expands over a vast distance before completely dissipating, and this cycle repeats for several months.
Jorge Hernandez-Bernal, a researcher at Sorbonne University in Paris and leader of the study published in the journal Nature Geoscience, indicated that simulating the phenomenon required the introduction of advanced theoretical physics that is studied in textbooks but is usually considered impossible in nature and has not been observed anywhere before.
Why does this news matter?
On Earth, clouds typically form when water vapor turns into droplets or ice crystals in the presence of fine suspended particles such as dust or salt. However, the new model suggests that the Martian cloud may form through a process known as Homogeneous Nucleation, where vapor converts directly into ice crystals spontaneously without any assistance from suspended particles.
This phenomenon is similar to condensation droplets appearing in the middle of a room instead of forming on a windowpane; it is a process that requires extremely harsh conditions, including a sharp drop in temperature by 30 degrees Celsius within just ten minutes, alongside relative humidity levels exceeding any value measured on Earth by 100,000 times.
The Role of the Volcano and the Martian Environment
The Arsia Mons volcano, which stands 65,000 feet high, plays a pivotal role in this cycle; as soon as wind currents collide with it, a powerful wave is created that pushes moist air into the upper atmospheric layers within a few minutes. Although it is assumed that similar phenomena occur in the atmospheres of other worlds such as Venus and Earth, this is the first time these high levels of atmospheric humidity on the surface of Mars have been reproduced and explained.