CRISM: Mesospheric cloud above Valles Marineris

CRISM is primarily known for spectrally mapping the surface of Mars, but it can also look at ices and aerosols in the atmosphere as well! The image shows a limb (meaning a view of the horizon) of the planet where the surface can be seen at the bottom with an orange tint, a cloud can be seen in the atmosphere, and space is seen above in black. In order to make these observations, the MRO spacecraft must pitch onto its side so CRISM no longer looks down at the surface, but instead out onto the horizon of the planet… [More at link]