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A new study by University of Chicago and Stanford University researchers suggests that hot, rocky exoplanets could not only develop atmospheres full of water vapor, but keep them for long stretches.
11 JANUARY 2021 Tithonium Chasma is one big canyon. At a staggering 810 kilometres (503 miles) long, it's a large part of Valles Marineris - the biggest canyon system we know of in the whole Solar System. This close-up image of the chasma was taken back in 2013 by the High Resolution Imaging Science Experiment (HiRISE) camera on board the Mars Reconnaissance Orbiter, and was just featured as the HiRISE Picture of the Day. The image shows around a kilometre (0.6 miles) of Mars terrain with torturous hills and valleys, but as you can see in the other images, when you start to zoom out, t...