Assuming no other compounds are initially present, what would happen to a body of earth's mass, orbiting the sun at earth's distance and speed, which is entirely composed of water? Assume that it just blinks into existence, and initially all the water molecules are arranged in a liquid sphere, and it is 50 degrees celsius at all points. Would it form a sphere? What would the density at the centre of the planet do to the water? Would hydrogen and oxygen somehow form at the surface, or would the atmosphere be solely composed of steam? Perhaps the surface would freeze over? What properties would the planet possess once it has stabilised? How much is it possible to theorise about the chemical composition at this point, as the planet contains only hydrogen and oxygen?