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And it also contains a few vague but, by definition, deadly serious threats. Tiny variations in sunspot generation could lead to another ice age. And – as the people of Malmo found out a few years ago – a glancing blow from a solar storm could extinguish a city’s power supply. Presentational duties are split between Kate Humble (gushes enthusiastically, goes on nice mini-breaks) and Dr Helen Czerski (wears a lab coat, talks to boffins). ‘Horizon’s’ big challenge is always to maintain a balance between dry and trivial. This one gets it just about right.