Enormous Dust Storms on Mars Highlight the Red Planet's Weather Mysteries

Two large dust storms in two weeks, each spanning an area larger than the United States, have researchers pondering the atmospheric dynamics on Mars.

Two 2001 images from the Mars Orbiter Camera on NASA's Mars Global Surveyor orbiter show a dramatic change in the planet's appearance when haze raised by dust-storm activity in the south became globally distributed. Credit: NASA/JPL/MSSS