Mars often feels finished. Mapped, scanned, labelled in broad strokes. Yet every so often, something unsettles that sense of familiarity. A shadow where none was expected. A shape that does not fit ...

Fresh orbital images and new geological analysis have revealed eight mysterious caves on Mars that appear unusually well suited to protect traces of life. Together, these caverns, portals and ...

CHEYENNE, Wyo. (AP) — Paleontologists digging at the bottom of a strange cave in northern Wyoming say they have uncovered a trove of animal bones from the last ice age this summer and have enough ...