Nasa has released more incredible images of the surface of Mars, this time sharing pictures of giant Martian sand dunes taken by their Curiosity rover.
The newly-released pictures were taken on 18 December, which was Curiosity's 1,197th Martian day in operation.
Showing the so-called 'Namib dune', which is around 5 metres tall, and the far-reaching flat plains around it, it's striking how similar the surface of Mars looks to deserts on Earth.
However, the differences between the two landscapes should become clear once Curiosity makes some closer inspections - it's currently examining dunes in the Bagnold field, giving scientists and geologists the first-ever close look at active sand dunes on another planet than the Earth.
Now that Curiosity has arrived in the region, researchers from the US Geology Survey's (USGS) Astrogeology Science Centre will start conducting tests and experiments on the surface material - using Curiosity's wealth of scientific instruments to study the chemical makeup and grain size of sand on Mars's surface, as well as monitoring the atmosphere using Curiosity's visual cameras.
It's yet another piece of important work for the rover, which in its time on the Red Planet has made the huge discovery of flowing water on Mars - a find which has huge implications for the possibility of life on the planet.
