Liquid metal, ruby and sapphire could rain down on huge exoplanet

A hot, giant exoplanet, called WASP-121b, could experience ruby and sapphire rain. Astronomers developed a three-dimensional model of the planet based on observations taken from a spectroscopic camera aboard the Hubble Space Telescope. The exoplanet has a hot day side that always faces its star, and whips around in an orbit of just 30 hours. Winds could be blowing vapourised titanium and aluminium from the hot side to the night side, where it rains down as droplets of liquid metal, ruby and sapphire.