Mars was once a 'blue planet': Ancient river deltas point to vast ocean

Using images from cameras on Mars orbiters, an international research team has discovered structures on Mars that are very ...
来自MSN

Strange Geological Structures Found on Mars—But No One Can Explain What’s Creating Them!

Mars has fascinated scientists for decades, particularly its intriguing gullies etched into the sandy dunes of theRed Planet. These long, narrow features initially suggested the presence of liquid ...