Public domain
The Changing Dunes of Wirtz Crater
From the collection of NASA Image and Video Library. Free to download, adapt and use — no permission needed.
About this work
The large dark feature is a classic Martian sand dune. Most sand on Earth is made from the mineral quartz, which is white and bright. On Mars, most sand is composed of dark basalt, a volcanic rock. For this reason, dunes on Mars are darker than those on Earth.
NASA Image and Video Library’s own descriptionCredit lineThe Changing Dunes of Wirtz Crater. NASA/JPL, 2017-01-19. Public domain. ID: PIA12289.
