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 center of the dune field. In this image the crescent nature of the individual dunes can be see in the lower left portion of the image. As the dunes coalesce the crescent form is lost. The Odyssey spacecraft has spent over 15 years in orbit around Mars, circling the planet more than 69000 times. It holds t…
