When you look up on a clear night and see stars, what are you really looking at? A twinkling pinprick of light with a hint of colour?
Imagine looking at a starry sky with eyes like prisms that separate the light from each star into its full rainbow of colour. Astronomers have built instruments to do just that, and spectroscopy is one of the most powerful tools in the astronomer’s box.
An article I published last week in The Conversation (which also got picked up by IFLS!).