关于这张图
Siton Undae is a large dune field located in the northern plains near Escorial Crater. Siton Undae is west of the crater and is one of three dune fields near the crater. The nearby north polar cap is dissected by Chasma Boreale, which exposes an ice free surface. This image shows part of the central region of the dune field. The bright surface between dunes in the lower corner is dune free. Several isolated dunes are visible. The majority of the dune field is made of connected dunes covering the entire surface. The Odyssey spacecraft has spent over 15 years in orbit around Mars, circling the …
