SPACE - Mars was once home to giant volcanoes, scientists find

Findings raise questions about conditions on the planet and whether or not it could have harboured microbial lifeAncient Mars was home to giant volcanoes capable of eruptions a thousand times more powerful than the one that shook Mount St Helens in 1980, scientists have said.The finding raises fresh questions about conditions on Mars in its early years, a time when scientists believe the planet was much more Earth-like, with a thick atmosphere, w ...

http://www.theguardian.com/science/2013/oct/03/mars-once-home-giant-vo