|
|
|
|
We know from a study of our own planet that climates of long ago were different than climates of today. The fossil record suggests that some areas on Earth, now frozen, were once tropical; and that areas now desert were once wet and fertile. An intriguing question, particularly if we are to speculate abut life on Mars is: Was Mars always as dry as it is today; or, was it once warmer, wetter, and more hospitable to life?
Slide 14 of 22