s*****t
发帖数: 1994 | 1 Valles Marineris: The Grand Canyon of Mars
Credit: Viking Project, USGS, NASA
Explanation: The largest canyon in the Solar System cuts a wide swath across the face of
Mars. Named Valles Marineris, the grand valley extends over 3,000 kilometers long, spans as
much as 600 kilometers across, and delves as much as 8 kilometers deep. By comparison, the
Earth's Grand Canyon in Arizona, USA is 800 kilometers long, 30 kilometers across, and 1.8
kilometers deep. The origin of the Valles |
|
