Glass storms of 8,600 km/h ravage planet

Like Earth, HD 189733 b is a blue planet, but the colour is not due to water. According to astronomers, the blue colour results from silicate particles – a type of very small pieces of glass. In 2015, scientists from the UK University of Warwick calculated, that wind speeds reach about 8,600 km/h. The scientists measured how much light was absorbed by the atmosphere's sodium molecules and how it changed during the planet's orbit of the star. The difference indicates how much the molecules moved, which allows us to estimate the windspeed.