A group of amateur stargazers has identified an entirely new form of aurora that looks a bit like sand dunes.
NASA's Curiosity rover has photographed a huge wall of sand on the edge of the Martian desert.
Scientists have determined how huge sand dunes up to 300ft high managed to form on the Saturnian moon.
Three scientists believe they've determined why some sand dunes produce a strange humming sound.
NASA has captured images showing sand dunes on Mars shifting over the course of several years.
These tree-like shapes aren't actually trees at all but sand dunes coated in a thin layer of frozen carbon dioxide.