NASA @NASA
@Mele07885506 @NASAPersevere @NASAJPL We've found water ice and water vapor (yup, Martian clouds), but not definitive evidence of liquid water on Mars today. We can tell from the rocks that Mars used to have lots of liquid water. The area where @NASAPersevere is now is an ancient river delta. https://t.co/cmAbifJ1a6 — PolitiTweet.org