Glass rain gives planet its blue hue

For the first time, astronomers have determined the true colour of a planet orbiting another star. The world, known as HD189733b, has a deep azure hue - the result of silicate (glass) rain in the atmosphere which scatters blue light. via Pocket http://www.bbc.co.uk/news/science-environment-23275607#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa