Millions of miles from Earth lies a dusty, cold, desert world with a very thin atmosphere. You know this planet as Marsbut it hasnt always been this way. Theres evidence that the Red Planet was much wetter and warmer, with a thicker atmosphere, billions of years ago. Could it also have supported life? NASAs Perseverance rover launches next week and will explore the Red Planet to collect rock and soil samples, which may preserve ancient signs of life. Join experts on #NASAScience Live Wednesday, July 22 at 3:00 p.m. EDT, to learn more about this robotic astrobiologist.