The other day I posted a rather smashing photo of a Chennai sunset which lit up the sky in purples, pinks, oranges and reds. I referred a question to my fellow blogger, Tom, about why the sky had all these amazing colours. Many thanks Tom for taking the time to answer it!
![Blogstronomy: Why is the Sky Purple?](http://peterclaridge.com/wp-content/uploads/2011/09/DSC03555-small1.jpg)