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In 2018, a camera on board the Mars Express mission caught sight of a strangely long and wispy cloud, billowing across the surface of the red planet. From a distance, the 1,500-kilometer (930-mile) trail of fog almost resembled a plume of smoke, and it seemed to be emerging from the top of a long-dead volcano. Looking back at archived images, researchers soon realized this had been happening for a while. Every few years in spring or summer, this curious cloud would return, before disappearing once again. The fleeting plume was caught on camera in 2009, 2012, 2015, 2018, and again...

Nasa release on the topography of the south polar region of Mars Scientists studying pictures from Nasa's Odyssey spacecraft have spotted what they think may be seven caves on the surface of Mars.The candidate caves are on the flanks of the Arsia Mons volcano and are of sufficient depth their floors mostly cannot be seen through the opening. Details were presented here at the Lunar and Planetary Science Conference in Houston, Texas. Temperature data from Mars Odyssey's Themis instrument support the idea. The authors say that the possible discovery of caves on the Red Planet is significant. The caves...