A rock on Mars spilled a surprising yellow treasure after Curiosity accidentally cracked through its unremarkable ... just hanging about on the Martian surface suggests that there's something ...

You dive toward the towering cliff face, the rocky surface rushing up to meet you. At the last second, a narrow crack appears—just wide enough. You angle in. Everything blurs. Stone walls close in ...

Tephra includes large, dense chunks, light rock debris, and ash ... On volcanoes, a fissure is an elongated fracture or crack at the surface from which lava erupts. Fissure eruptions typically ...