RT @AstronomyNow: Martian valleys could have been carved by surprisingly little water in 10,000 years or less astronomynow.com/2015/11/05/mar… https://t.co/wQBK6IJF0z
RT @AstronomyNow: Martian valleys could have been carved by surprisingly little water in 10,000 years or less astronomynow.com/2015/11/05/mar… https://t.co/wQBK6IJF0z