Long before Mars became the cold, dry world we see today, rain once fell across its surface. Water gathered in low-lying valleys and river channels, overflowed crater rims, and rushed through canyons. Some of that water may have traveled far…
Long before Mars became the cold, dry world we see today, rain once fell across its surface. Water gathered in low-lying valleys and river channels, overflowed crater rims, and rushed through canyons. Some of that water may have traveled far…