NASA @NASA
Is there life on Mars? We haven't discovered life on Mars, but we have found lots of evidence that it could have supported life in its past. There’s even a chance that Mars could be habitable under the surface. @NASAAstrobio expert Heather Graham explains. https://t.co/KaRBlj5YPW https://t.co/KneHzKvdeV — PolitiTweet.org