Public domain
An Ancient Valley Network
From the collection of NASA Image and Video Library. Free to download, adapt and use — no permission needed.
About this work
Most of the oldest terrains on Mars have eroded into branching valleys, as seen here in by NASA's Mars Reconnaisance Orbiter, much like many land regions of Earth are eroded by rain and snowmelt runoff. This is the primary evidence for major climate change on Mars billions of years ago. How the climate of Mars could have supported a warmer and wetter environment has been the subject of scientific debates for 40 years.
NASA Image and Video Library’s own descriptionCredit lineAn Ancient Valley Network. NASA/JPL, 2017-05-09. Public domain. ID: PIA21630.
