Rover findings indicate stratified lake on ancient Mars

a reply to: JohnHutto06

Are you kidding me? We have deep sea autonomous vehicles and submersibles operative in near enough every ocean, right this minute. The difficulties pertaining to exploration of extreme depths in a liquid medium, are, in many ways, far more challenging to overcome, than the difficulties of exploring in vacuum or near vacuum ever are.

Furthermore, if you are talking about the sheer number of resources deployed to observe a given planet, Earth is the most observed planet. We have more satellites looking down at us, making maps, tracking movements, surveying temperature, humidity, sea level of what they are looking at, than we do orbiting ANY other body in the solar system. We know FAR more about our planet than we do about Mars, because we have been able to take physical samples of the Earth and analyse them directly, apply vast numbers of tests, using a plethora of different equipment, to the task.

Although the various Rovers we have sent to Mars have had many experimental units on board, the fact of the matter is that the sum total of knowledge we have about the planet on which we live, totally DWARFS the sum total of the knowledge we have gained about Mars. The simple fact is, that there is a great deal more to know about our planet, than there is to know about Mars at the moment. Even if there is liquid water sequestered away, or in the soil, or even bacterial life or something just a shade more complex there on or under the Martian surface (doubtful on that last part), we have a planet which is so rich and biodiverse (even after all the species of plants, trees and animals that we have made extinct either through hunting, or through habitat destruction), this planet is still more informationally dense, than Mars ever is.