"Is There Living Green Algae in the Gusev Crater on Mars?"
Is There Living Green Algae in the Gusev Crater on Mars?
http://www.earthfiles.com/news/news.cfm?ID=650&category=Science
An interview with Mars Express scientists on the green and blue areas on Mars imaged by Mars Express. They express the view the colors are real but prefer an explanation due to minerals, though they don't rule out a biological explanation.
