"Under certain circumstances, liquid water has been found on Mars" - Jim Green, NASA Planetary Science Director https://t.co/MvErxberG3

— NASA (@NASA) 28 setembro 2015

Water! Strong evidence that liquid water flows on present-day Mars. Details: http://t.co/0MW11SANwL #MarsAnnouncement pic.twitter.com/JNksawz2iN

— NASA (@NASA) 28 setembro 2015