#Return of the extremely elongated cloud on Mars
“#Return of the extremely elongated cloud on Mars” Credit: ESA/GCP/UPV/EHU Bilbao A mysteriously long, thin cloud has again appeared over the 20-km-high Arsia Mons volcano on Mars. A recurrent feature, the cloud is made up of water ice, but despite appearances it is not a plume linked to volcanic activity. Instead, the curious stream forms…