NASA releases detailed pictures of Mars
NASA has released thousands of high-resolution images of Mars, taken from the Mars Reconaissance Orbiter (MRO).
They show a vast range of geographical features in detail, including craters, gullies and dunes, such as this crater near Ianis Chaos.
The Mars Reconnaissance Orbiter has been studying Mars with an advanced set of instruments since 2006, and has returned more data about the planet than all other past and current missions to Mars combined, says NASA.
The newly-released pictures form part of over 1,500 telescopic images recorded by the High Resolution Imaging Science Experiment (HiRISE) camera between April and early August.
Each image covers a strip of Martian ground six kilometers (3.7 miles) wide and about 12 to 24km long, showing details as small as one meter, or yard, across.
More images are available here.