12-mile-high martian dust devil caught in act
(NCYT/JPL) Dust devils occur on Earth as well as on Mars. They are spinning columns of air, made visible by the dust they pull off the ground. Unlike a tornado, a dust devil typically forms on a clear day when the ground is heated by the sun, warming the air just above the ground. As heated air near the surface rises quickly through a small pocket of cooler air above it, the air may begin to rotate, if conditions are just right.
The image was taken during late northern spring, two weeks short of the northern summer solstice, a time when the ground in the northern mid-latitudes is being heated most strongly by the sun.
|A Martian dust devil roughly 12 miles (20 kilometers) (Photo: NASA/JPL-Caltech/UA)|
This site is no longer updated.
Click this link to have updated astronomy news.
About the Author
©TheAllINeed.com All rights reserved