.....Good question! We’re trying to find out. I found evidence of an ancient stream on Mars that once flowed with water—something needed for life as we know it.
— Curiosity Rover (@MarsCuriosity) September 30, 2019
The #Mars2020 rover, launching in July, will take samples & search for more clues: https://t.co/C966SCxQgR #AstronautSnoopy pic.twitter.com/5mGPFUa55a