Cornell News: Mars cyclone images

https://archive.today/20120805/http://www.news.cornell.edu/releases/May99/mars.cyclone.deb.html

Astronomers using NASA's Hubble Space Telescope (HST) have discovered an enormous cyclonic storm system raging in the northern polar regions of the planet Mars. Nearly four times the size of the state of Texas, the storm is composed of water ice clouds…