MarsNews.com

Strange cloud puzzles Mars scientists Ananova

Astronomers have found a large spiral cloud above a giant Martian volcano. A passing probe took a picture but scientists aren’t sure how long it has been there. They say the cloud is probably made up of fine dust grains and it is spiraling because of wind patterns in the volcano crater. Similar clouds were seen for several days in the same area but research teams say they don’t know if it was a single cloud that persisted or one that grew each afternoon.