Distant planet's clouds made of ruby and sapphire minerals
A giant gas planet around 1,000 light-years from Earth is covered with clouds that appear to be made from corundum, the mineral that rubies and sapphires are made of, according to the first exoplanet meteorology report. Based on analysis of four years of Kepler satellite telescope, the planet was estimated to have surface temperatures above 2,000°C, near corundum's boiling point.