Sixty-three light-years from Earth, a planet wears the color of our oceans while concealing conditions that bear no resemblance to anything gentle. HD 189733b, a gas giant discovered in 2005 and studied in detail since 2013, appears deep blue not because of water but because molten glass particles scatter blue light through an atmosphere reaching 2,000 degrees Fahrenheit. Astronomers have used its regular transits across its star to measure winds exceeding 5,400 miles per hour — making it one of the most legible and most extreme weather systems ever studied beyond our solar system. In borrowin