NASA @NASA
For the past year-and-a-half, our Perseverance Mars rover has been collecting samples in an ancient river delta. Join the mission team for an update on what they've found. Sept. 15 11:30am ET (15:30 UTC): https://t.co/b7lG3TlhI2 Drop your questions using #AskNASA. — PolitiTweet.org