An amateur scientist has compiled a forecast to enable observers to view a mysterious type of cloud.
The project is part of a series for BBC Radio inviting members of the public to submit their ideas for a scientific research project.
The eerie, "noctilucent clouds" clouds form at the edge of space, far higher in the atmosphere than more familiar clouds.
Here, BBC News looks at plans by the amateur astronomer, John Rowlands, to observe these phenomena.
Noctilucent clouds appear as wispy, luminous, silvery-blue clouds in the dark Northern sky, often with a wavy pattern.
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http://www.bbc.co.uk/news/science-environment-10666764audio slideshow:
http://www.bbc.co.uk/news/science-environment-10635796