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The couple have a long history of working for social good: Chris raises money for charity as a singer in the socialist street choir Cor Cochion, while Valerie has been volunteering with Cruse Bereavement Support for 21 years.

He'd spotted a star system, about 3,000 light years away, called T Corona Borealis - or T Cor Bor for short - exploding into brightness, becoming visible in the night sky for a few short days.

Now a whole new generation of stargazers are scanning the skies again because scientists believe T Cor Bor ignites about every 80 years or so.

"T Cor Bor is dim at the minute - it's magnitude 10, well below what you can see with the naked eye," explains Dr Jenifer Millard from Fifth Star Labs.

To the west of this star is the curved constellation of Corona Borealis, made up of seven stars, and where T Cor Bor will at some point light up.