Mars absorbed water on its surface like sponge: Study
Is there life on Mars? Perhaps, as there once was water, say NASA scientists
What Happened to Mars's Water? It is Still Trapped There
A lake of water was found on Mars — and may be the first of many
Animated Map: Where to Find Water on Mars
Was there life on Mars? NASA rover boosts case
Water on Mars - Wikipedia
Animated Map: Where to Find Water on Mars
Maybe Mars Didn't Lose its Water After All. It's Still Trapped on the Planet - Universe Today
Why did Mars dry out? New study points to unusual answers
Mars Might Not Have Enough Water to Support Life; Here's What It Means