This is a good one. Sent in by Gary. We have two links, https://www.space.com/37654-exoplanet-55-cranci-e-facts.html … www.planetary.org/articles/the-different-kinds-of-exoplanets-you-meet-in… … and here we have the different kind of exoplanets that have been discovered – orbiting other stars. Some look like planets in our solar system. Some do not. The smaller planets are generally rocky and the larger ones, it is thought, are gassified. Some may even be watery. That is the great hope. In a few short years from nothing to 4000 exoplanets are now known. Some may of course be calculated guesses but there is no reason why other stars do not have planets in orbit. On page 8 of the www.planetary.org link we have 55 Cranci e – a rocky planet that has been described as a super earth. Its surface, we are informed, is molten. 55 Cranci e probably has an atmosphere of carbon dioxide – and evaporated rock. It may even rain sand. Yet, it is a super earth. Gary is the author of 'Extraterrestrial Sands' Matador:2016 (see www.troubador.co.uk/matador ) which concerns the origins of the sand in the Arabian and Sahara deserts (in fact, deserts anywhere on earth). He considers it has an origin on Mars and at www.youtube.com/watch?v=ZEyAs3NWH4A … we have a video of the surface of Mars. He compares this to an image of Venus, which has striking paralells with the surface of Mars as portrayed in that video …