In the past few weeks, donations to Zach's cause -- the Children's Cancer Research Fund -- skyrocketed, as did downloads of his song, " Clouds, " which at the time of his death had more than 2.9 million page views on YouTube.

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The birth and death phases of stars, for example, are associated with heavy dust clouds that give off an infra-red signal which might resemble the swarm of artificial satellites constituting a Dyson sphere.

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Annabel Pitcher has been nominated for her second novel, Ketchup Clouds, about a girl with a terrible secret who confesses all to a death row convict, while Skin Deep by Laura Jarratt follows Jenna, who has been left permanently scarred following a car crash that killed her best friend.

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