NASA scientists won't have to wait until InSight's 2016 drilling mission to see what lies beneath the surface of Mars -- Curiosity is already on the case. After developing a taste for Martian soil late last year, the intrepid rover has started exploring the red planet's bedrock, drilling a 0.63 inch (1.6 cm) wide hole 2.5 inches (6.4 cm) deep into Mars' surface. Curiosity will spend the next several days analyzing the resulting powder in hopes of finding evidence of a
