Water supply managers for the Delaware River Basin this week declared an “emergency,” setting the stage for further action if dry conditions persist. The Delaware River Basin Commission declared the ...

Billions of years ago, it rained on Mars. The water collected in valleys and rivers, filled and spilled over the rims of craters, and was funneled into canyons, perhaps even making its way to a large ...

"We did the simplest thing that could be done — we just mapped them and pieced them together." When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

Ancient Mars is coming into sharper focus as a planet laced with rivers, deltas and vast drainage basins, and that new map of its watery past is rapidly reshaping where scientists intend to look for ...