Ancient lake shore on Mars: Primo spot for hunting signs of past life?

Turn the clock back 3.4 billion years, transplant North America’s Lake Champlain to the floor of Mars’ Shalbatana Vallis, and you have a pretty good idea of what a team of scientists says it has uncovered on the red planet. The find suggests that substantial amounts of water pooled and persisted on the martian surface hundreds of millions of years later than many planetary scientists currently