NASA Shows Amazing Pics of “Blue” Dunes on Mars

Nasa has released a stunning image from Mars showing an area covered by a sea of "blue" sand dunes.

The picture shows the sand dunes covering the planet's northern polar cap, where temperatures can reach as low as -150C (-238F).

Nasa says the sand dunes actually cover an area the size of Texas, the second largest US state, which has an area of about 695,662 km²