the planetary puzzle of life on mars. you've heard of cures. nasa's rover studying the geology on the ground. maven is hoping to study mars from above and answer a 4 billion-year-old question what made the fourth planet from the sun turn red and barren. >> it's gone from a desert, geological world, kind of boring rocks to this exciting blooming world with a history that does include warm wet times, climate change, dynamic atmosphere, land strides, ice sheets, buried ice, unbelievable. >> reporter: scientists believe mars may have looked like earth with blue skies and warm temperatures. >> we do believe mars at one point had liquid water, correct? >> reporter: absolutely. evidence in the rocks from curiosity is literally unassailable. we see the record even in the frozen materials in the soils today. >> collecting new measurements will give those analyzing the data give them a better