Mars’s Grand Canyon is as long as the United States
This is the Valles Marineris, believed to be the biggest canyon in the entire solar system. At nearly 2,500 miles long, it would stretch clear across the continental United States. Much like Mars’s highest peak, Olympus Mons, the sheer scale of Valles Marineris is almost incomprehensible. Depending on how you measure it, its total length…
