There is a distant world where quartz crystals float above a searing hot, puffy atmosphere. Vaporised sand grains, not water droplets, form the clouds that fill the sky on Wasp-107b, a planet 1,300 light years from Earth.
Then there is GJ1214, the sauna planet. With a mass eight times that of Earth, it orbits its parent star at a distance that is one-seventieth of the gap between Earth and the sun and seems to be coated in a thick dense atmosphere containing vast amounts of steam.
