Dust storm on Mars

Hubble images of the Sinus Meridiani region taken on October 28, 2005 show evidence of a regional dust storm. A comparable Hubble image taken on June 26, 2001 of the same region shows a storm-free environment. The dust storm, which is about 930 miles (1500 km) long, is about the size of the states of Texas, Oklahoma, and New Mexico combined. Ground-based amateur telescopes have been watching the storm grow and evolve.