Mars may have been a "blue planet" with an ocean the size of today's Arctic Ocean, a new study suggests.

"The structures that we were able to identify in the images are clearly the mouth of a river into an ocean." The post ...

Mars is absolutely dripping with evidence that the red planet was once a striking blue, complete with glistening lakes, ...

Using images from cameras on Mars orbiters, an international research team has discovered structures on Mars that are very similar to classic river deltas on Earth. These are traces of rivers that ...