By Ivy S. Carpenter A giant gash scars the surface of Mars.  Known as Valles Marineris, it is one of the largest and most recognizable topographic features in our solar system.  Boasting a whopping 4000-km length and a depth ranging from 10 – 15 km, it easily dwarfs Earth’s Grand Canyon (which is a piddling … Continue reading The Grandest Canyon: New insight into Mars’ Valles Marineris