On a distant world 63 light years away, winds reach over 5000 mph and sweep molten glass through the sky. HD 189733b appears as a deep blue marble, its color caused not by water but by an atmosphere rich in silicate particles. Orbiting close to its star, daytime temperatures near 2000 F melt these particles into liquid glass. Observations made in 2015 marked the first mapping of an exoplanetary weather system and offered new insights into the extreme climates of other worlds. | The History Archi