NASA @NASA
Imagine Mars, 3.5 billion years ago. What did it look like? Findings from our @MarsCuriosity rover suggest that the Red Planet's Gale Crater might have been filled with waterways in the ancient past. Travel back in time: https://t.co/t2RFiR7FHA https://t.co/uugMzPDbMN — PolitiTweet.org