From Leah Crane at New Scientist:
NASA’s MAVEN (Mars Atmosphere and Volatile Emission) spacecraft found layers of atmospheric metal ions that defy models based loosely on Earth’s atmosphere.
The space between planets is full of metallic dust and rocks. As they are drawn into a planet’s atmosphere, they burn up, leaving behind metal particles like iron and magnesium. On Earth, the behaviour of those particles is mostly controlled by the planet’s strong magnetic field. They use magnetic fields as a sort of highway, and stream along the magnetic field lines to form thin layers throughout the atmosphere.
But Mars has no such field. The planet does have small regions with weak magnetic fields in its southern hemisphere, but without a global field like Earth’s, it should not be able to form the layers that MAVEN sees.More.
Guess we’ll have to live with it, right? It’s good to be reminded of the dangers of too much certainty. 😉
See also: Was evidence for liquid water on Mars really discovered last year? Doubts surface.
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