craterchains (Norval said:So it is now official from NASA that Mars did have a lot of water on it, and that that water HAD to have been in recent history.
Because of the decay rates of some elements that form under water when exposed to out of water conditions they know that water had to be on Mars in very recent history. In the neighborhood of less than a couple hundred years.
They may discover when re-examing the images from Viking and Mariner missions that the water substance was even more rescent than a couple of hundred of years.
But wouldn't that information have to come from another source than NASA, say like European agencies (ESA) because the American Defense agencies would not release viable information?