Science and Technology Facilities Council
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Astrophysicists map out the light energy contained within the Milky Way

We’ve always been fascinated by the stars. Our creation stories, myths and legends are full of references, and our poets and storytellers constantly evoke their wonder - such as Irish poet Thomas Moore:

"By cloudless starlight on he treads, And thinks no lamp so cheering, As the light which Heaven sheds."

But how much light do these heavenly lamps actually emit? Scientists at the University of Central Lancashire, with colleagues in Romania and Germany, set out to find out – as part of wider work to understand how stars and galaxies form and evolve. Using novel computer calculations they set out to track all the photons in our Galaxy, including not only visible “light” but photons emitted as heat from the clouds of interstellar dust. After comparing their predictions with latest satellite images, the team believes they have found the answer. The full research is published in the Monthly Notices of the Royal Astronomical Society.

Channel website: http://www.stfc.ac.uk/

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